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A6RICULTUK
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OCT l|41994
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CLIMATE OF ILLINOIS
Summary and analysis of long-time weather records
By JOHN L. PAGE
Associate Professor of Geography
College of Liberal Arts and Sciences
University of Illinois
Bulletin 532 • UNIVERSITY OF ILLINOIS
Agricultural Experiment Station • Urbana, April, 1949
FOREWORD
THE NEED for revising or rewriting Experiment Station Bulletin 208, CLIMATE OF ILLINOIS, published in 1918, has been felt keenly for a number of years. It was during a conference in 1942 with Professor W. L. Burlison, Head of the Department of Agronomy, and other members of his staff, that the author agreed to undertake the work. Compilation of Appendix C (Precipitation During Growing Season) was begun almost immediately, but the work was soon interrupted by the pressure of the war years and had to be put aside until the fall of 1944.
In preparing a bulletin such as this, one must of necessity obtain data from sources other than his own. Most of the data in this bulletin were obtained from the U. S. Weather Bureau. Acknowledgment is made to E. W. Holcomb, Chief Meteorologist at Springfield, for resolving certain discrepancies which ap- peared in the published data of the Weather Bureau; to Corporal (now civilian) Leon T. Stewart of Chanute Field for the data on which Figs. 2, 3, 4, and 5 are based; to Miss Marjorie Pryor for her painstaking care in compiling some of the data in Appendix C; and to my wife, Jesza Page, for valued assistance in checking data.
THE AUTHOR
CONTENTS
Page
INTRODUCTION 97
CONTROLS OF CLIMATE 99
Latitude 99
Continental Location 1 00
Winds 1 00
Storms and Air Masses 1 00
Collective Effect of Controls 1 09
TEMPERATURE 1 09
Average Monthly Temperatures 113
Geographical variations 114
Yearly variations 1 20
Absolute Highest and Absolute Lowest Temperatures 122
Differences in Averages Compared With Differences in Extremes. .123
Temperature Has Fluctuated But Hasn't Changed 123
Frost and Growing Season 126
PRECIPITATION 1 29
Amount of Precipitation 130
Distribution Thruout the Year 131
Wettest months 139
Driest months of growing season 139
Dependability of Precipitation 1 39
Driest and wettest years 1 40
Wet and dry growing seasons 141
No long-time change in amount of precipitation 142
Snowfall 145
APPENDIX A: Detailed Temperature Data 149
APPENDIX B: Monthly and Annual Precipitation 199
APPENDIX C: Precipitation During Growing Season 295
LIST OF TABLES, MAPS, AND GRAPHS 364
96
CLIMATE OF ILLINOIS
TEMPERATURE, pressure, winds, and moisture of the atmosphere all go together to make up climate. Of these four elements, temperature and moisture, or precipitation, are the most important. For this reason, and for the further reason that there is more information about them, they receive practically all the attention in this bulletin.
An effort has been made to bring together in table form more data on the temperature and precipitation of Illinois than has previously appeared in one publication. Supplementing the tables are maps and graphs showing both seasonal and geograph- ical distribution of these two elements.
Since temperature and moisture, as well as winds and pres- sure, can vary widely from time to time, records extending over a number of years are necessary for an accurate description of the climate at any given place. A period somewhat better than thirty years is desirable in a middle-latitude, continental area like Illinois. Within that length of time, most extremes of weather are likely to occur, if not repeat themselves. Many stations in Illinois have kept records of temperature and precipitation for more than thirty years; some records go back nearly a hundred years. Data from all these long-record stations have been used in preparing this bulletin.
In addition to the long records, data from a number of short- record stations and from a few stations just outside the state have been used to fill out the description of Illinois climate. Each record, while portraying conditions at only one place, may, of course, be considered roughly representative of the surround- ing area. Used together, the records show seasonal and yearly variations in all parts of the state, and point up the diversity in climate which would naturally be expected in Illinois, with its area of 56,663 square miles, its north-south length of about 385 miles, and its maximum width of about 215 miles.
Much more can be said about the climate of Illinois than is said in this bulletin. To treat all phases of the subject or to
97
98
BULLETIN NO. 532
[April,
IDENTIFICATION MAP
Stations from which data were obtained. In addition to all long-record sta- tions still operating in Illinois, some short-record stations were included because of topography or distance from other stations. Data from some stations outside Illinois were used if location of the station or length of observation made the records helpful. U. S. Weather Bureau climatological divisions of the state are also shown. (Fig. 1)
1949] CLIMATE OF ILLINOIS 99
touch upon all possible effects of climate on man and his activi- ties would require a publication much beyond the scope of this one. It is hoped, however, that in the future more detailed studies will grow out of the data presented here.
CONTROLS OF CLIMATE
In Illinois four principal controls are responsible for varia- tions in weather. They are (1) latitude or sun, (2) continental location, (3) winds, and (4) storms and their associated air masses. Altho winds are considered a part, or element, of climate, they also have an important effect on temperature and moisture and thus are often more important as a control than as an element.
Latitude
The difference in latitude between northern and southern Illinois is reflected in differences in length of day and in the sun's position. At East Dubuque or South Beloit, in the extreme northern part of the state, the longest day is about 15 hours and 15 minutes. At Cairo, at the southern tip of the state, the longest day is about 14 hours and 40 minutes. The shortest day is about 9 hours and 1 minute in the extreme north and 9 hours and 38 minutes in the extreme south.
At noon suntime on June 21, normally the longest day in the year, the sun lacks 19 degrees of shining vertically at East Dubuque or South Beloit and 13% degrees at Cairo. On De- cember 22, generally the shortest day in the year, the noon sun at these places lacks 66 and 60% degrees respectively, of being directly overhead.
On March 21 and September 22 the days and nights are of equal length thruout the state, but the noon sun is 5% degrees more direct at Cairo than at East Dubuque or South Beloit. It lacks 42% degrees of being vertical in the extreme north, and 37 degrees in the extreme south.
The variations in length of day and directness of the sun's rays play a rather prominent role in temperature differences between summer and winter, and to some extent between northern and southern Illinois during both seasons. The lati-
100 BULLETIN NO. 532 [April,
tudinal location and extent of the state has a further important, tho indirect, effect on climate by determining the relation of the state to the paths of cyclonic storms. The effects of these storms, which cause masses of strikingly different air to invade the state from all directions, are discussed below.
Continental Location
The continental location of Illinois, together with the lati- tude, makes for hot summers and cool to cold winters. The severity of the winters is more peculiar to the area than is the summer heat. Hot summers occur both north and south of Illi- nois, but the winters are far less severe to the south than in this state. Continental location also assures that January will nor- mally be the coldest month and July the hottest, altho this is not true every year.
Lake Michigan tempers the climate slightly, but its influence is often overemphasized. A body of water no larger than Lake Michigan can influence the temperature, at most, only a few miles away. However, the temperature of the water, which is warmer than the surrounding land in autumn and cooler in spring, does affect the paths taken by cyclonic storms when crossing the area of the Great Lakes.
Winds
Winds of Illinois come mostly from the southwest, west, and northwest, with southwest winds somewhat more common in the summer, and northwest in winter. A change in the direction of the wind will almost immediately affect the temperature as well as the moisture condition of the air. These effects of the wind are due to characteristics acquired at its place of origin, or to modifications resulting when the wind passes over different areas.
Storms and Air Masses
During much of the year cyclonic storms exercise the dom- inant control over the climate of Illinois. It is the inter- change of air masses, associated with fronts of cyclonic storms, that gives the weather of Illinois its great variety.
1949] CLIMATE OF ILLINOIS 101
A study of almost any daily weather map will show the rela- tion of weather to cyclonic storms, with their associated fronts and air masses. Figs. 2, 3, 4, and 5 (pages 102 to 106) are similar to the daily maps put out by the United States Weather Bureau, but because of their scale are necessarily somewhat more simpli- fied. These particular maps were selected because they show cer- tain types of weather for the Middle West in general and for Illinois in particular.
Fig. 2 shows the contrasts in weather which a cyclonic storm, with its associated fronts and air masses, may produce within the state. At this time (May 8, 1943) southern Illinois was hav- ing southerly winds, generally clear skies, and temperatures in the high sixties, while the central and northern parts of the state were having northeasterly winds, cloudy skies, steady rain, and temperatures in the forties and fifties. The precipitation was caused by the fact that the warm maritime (mTw) air was meeting the cooler (mPk) air at the warm front and was being forced to rise over it. This happened much as tho central and northern Illinois were a mountain with a very gentle slope to- ward the south and with the wind blowing up over it.
This and somewhat similar situations (long, low pressure troughs extending from northeast to southwest, with cooler air to the north and warmer air to the south) are common during most of the cool periods of the year. They give Illinois its long- drawn-out cloudy and rainy spells, perhaps more characteristic of spring than of any other season. Sometimes the warm fronts may become stationary for two or three days, causing almost steady precipitation. This happened in central Illinois in May, 1943.
Had the low pressure trough been along the Ohio river, southern and central Illinois, instead of central and northern Illinois, would have been getting the rain, and northern Illinois would have been having weather somewhat similar to that pre- vailing in central Wisconsin.
Fig. 3 shows pressure, wind direction, and air-mass condi- tions producing hot, muggy weather in the eastern, central, and southern parts of the United States. Temperatures at this time (August 13, 1944) were in the nineties thruout much of these
102
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sections of the country. In Illinois, such temperatures had pre- vailed in the afternoons since August 9. While variations from this general weather setup may produce hot spells in Illinois, the variations are, for the most part, in degree rather than in kind.
As can be seen from this map, there was cooler weather, gen- erally in the seventies and eighties, in Minnesota and the Dakotas. The air mass (mPk) producing these lower tempera- tures, had its origin over the north Pacific ocean and was moving from northwest to southeast. It reached northern Illinois on August 16 and southern Illinois on August 17, giving the state a few days of respite from the heat. The decrease in temperature was associated with general rains thruout Illinois on those two days, varying in amount from .05 inch at Fairfield and Salem to 4.35 inches at La Harpe.
Fig. 4 shows conditions typical of "Indian summer." Note that there was very little cloudiness and no precipitation within the United States and that there were several degrees' difference between temperature and dew point of the air. Days were warm and nights were cool. The "Indian summer" weather shown on this map had begun on October 16 and lasted thru October 20. This kind of weather occurs frequently enough in the autumn to be characteristic of Illinois climate.
The cool air mass (cP) which produced this weather prob- ably had its origin in Alaska or northern Canada. It moved south over the Great Plains of Canada and the United States, circulating around a high pressure center or cell, and then, be- fore moving out over the Gulf of Mexico, swung back toward the northeast after having been warmed somewhat over the southern part of the country.
Fig. 5 shows how suddenly the wind direction may change and how markedly different the temperatures may be within short horizontal distances when different air masses are sepa- rated by a cold front.
For example, Chanute Field, with its maritime tropical air mass (mTk) from the Gulf of Mexico, had a temperature of 69° and a dew point of 58° on this day (November 8, 1945) ; Peoria with its continental polar air mass (cPk) had a temperature of
108 BULLETIN NO. 532 [April,
41° and a dew point of 36°. Temperature differences of about equal proportion occurred on the two sides of the cold front thru- out most of its extent. While this map sho'ws the conditions at 6:30 p. m., temperatures thruout the state decreased as the cold front moved eastward into Indiana. On the night of November 10 the temperature had dropped to the twenties in northern Illinois, to the thirties in central Illinois, and to the high thirties and low forties in southern Illinois.
The storm center was too far north to cause much precipi- tation, except in the extreme north-central part of the United States and the south-central part of Canada. However, a few showers and thundershowers did occur along the cold front. These were caused by the cold air pushing in under the warm air and forcing it to rise rapidly. Such invasions of cold polar air, pro- ducing sharp drops in temperature, occasional thunderstorms, and, less often, tornadoes, are by no means rare in the central part of the United States, especially from late October thru April and sometimes May. Often the contrasts in weather are more striking than those shown on this map. In January a setup of this kind might easily cause the temperature to drop more than 40 degrees within a 24-hour period. This happened in much of Illinois from January 21 to 22, 1936. However, the lowest temperature does not occur immediately when the cold air comes in, but many hours later, after heat has been radiated upward thru the air.
The types of weather shown on these four maps are char- acteristic of but not peculiar to Illinois. Many variations from these maps might be shown, but these indicate the important day-to-day effects of cyclonic storms and their associated air masses and fronts on Illinois weather. These effects are more pronounced during the cooler half of the year than during the warm months, because of the greater differences existing be- tween Canada and the southern United States in temperature and moisture conditions.
Weather and in time, therefore, climate are affected by thunderstorms which may or may not be associated with fronts. Tropical hurricanes also at times affect Illinois weather, but indirectly rather than directly.
1949] CLIMATE OF ILLINOIS 109
Collective Effect of Controls
When all these controls — latitude, continental location, wind, and storms and their associated air masses — are consid- ered collectively, Illinois has, on the average, hot summers, cool to cold winters, and rather abundant precipitation thruout the year with a rather high degree of reliability from year to year. The average, however, is made up of pronounced day-to-day differences in degree of temperature, wind direction and velocity, moisture conditions of the atmosphere, and precipitation.
TEMPERATURE
Any standard temperature reading represents the condition in an instrument shelter at a level of about 5% feet above the ground or above the roof of a building. The thermometer is so situated that it receives freely circulating wind regardless of the direction from which it comes. The position of the thermometer in the shelter, however, largely eliminates the effects of direct and reflected sunshine. This is why the official temperature is gen- erally different from the readings seen on some thermometers on the fronts of stores or incorrectly exposed at homes.
Temperature averages are used more often than extremes in this bulletin. (Sometimes the term mean or normal is used inter- changeably with average.) Average temperatures are, for the most part, arrived at in the following way : The average temper- ature for January 1, 1940, for example, is the highest plus the lowest for that day divided by two. The average for the month of January, 1940, is the sum of the daily averages divided by 31, the number of days in the month. An average temperature for January over a period of years is obtained by averaging the averages of the Januarys in those years. The average for any other month is obtained in the same way. Naturally, the longer the period of observation, the nearer the true average will be approached.
To obtain the average maximum temperature for January, 1940, the highest temperatures for all the days in the month are added and then divided by 31. The average January maximum for a number of years is the average of the average maximum tern-
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BULLETIN NO. 532
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Average temperatures, average extremes, and extremes for each month at seven long-record stations (° F.). Highest and lowest temperatures each month are the extremes regardless of year; average of highest and average of lowest are averages of monthly extremes for all years; average maximum and average min- imum for each month are the averages of daily extremes for all years. (Fig. 6)
1949] CLIMATE OF ILLINOIS 113
peratures for the Januarys of those years. Average minimum temperature is arrived at in the same way.
The average of the highest is used in a different sense than the average maximum. To get the average of the highest tem- perature for January over a number of years, only the one high- est temperature recorded in each January is used, and these temperatures are averaged. The average of the lowest is obtained in the same manner.
Table 1 gives the long-time average temperature for each month, and also the annual average, at sixty-four stations in Illinois and adjoining states. Data from Beloit, Wisconsin; Davenport, Dubuque, and Keokuk, Iowa; Louisiana and St. Louis, Missouri; and Paducah, Kentucky, are included since no satisfactory records are available for nearby points in Illinois.
In Appendix A (Tables 4 thru 8) more detailed data are given for seven long-record stations, including Dubuque and St. Louis. In Table 4 average temperatures are given for each month of each year and also for each year that records have been kept at the station. Table 5 gives the average maximum temper- atures month by month for each year and also year by year; Table 6, average minimum temperatures; Table 7, absolute highest temperatures; and Table 8, absolute lowest tempera- tures. Long-time averages of these data are also given for each month. (These tables will be found on pages 150 to 197.)
Fig. 6 presents graphically the highlights of the material given in Appendix A. Month-to-month differences in average temperature may be seen at a glance, as well as the changes, from month to month, in average maximum and average mini- mum temperatures; in absolute highest and absolute lowest temperatures ; and in the averages of the absolute highest and of the absolute lowest.
Average Monthly Temperatures
The month-to-month march of average temperatures is simi- lar thruout Illinois (Fig. 6). January and February are not markedly different from each other, but from February to March there is a marked increase. Until June, temperatures then con- tinue to rise rapidly from one month to the next. During the
114 BULLETIN NO. 532 [April,
summer months the changes are slight, altho July, on the aver- age, is the warmest month. Temperatures take a sudden dip from August to September; and decided month-to-month de- creases continue until December, the average for December be- ing slightly higher than that for January.
Altho seasonal changes follow approximately the same pat- tern thruout the state, the rate of change varies with geograph- ical location. In any one year, also, month-to-month changes in temperature may vary considerably from the long-time pattern.
Geographical variations. Every month average tempera- tures decrease, in general, from south to north, but the rate of decrease varies markedly from month to month. This is shown in Figs. 7 to 18. The general east-to-west trend of the isotherms (lines of equal temperature) on these maps indicates that lati- tudinal extent is the most important cause of the geographical variations. That many of the isotherms run from northwest to southeast, rather than due east and west, reflects the operation of Hopkins' Bio-Climatic Law (page 127). At times, however, winds, storms, and air masses skew some of the isotherms so that they follow a northeast-southwest direction. The almost north- to-south direction of the isotherms around Lake Michigan in some months reflects the influence of the lake. This influence is, however, less direct than indirect. The lake has an effect on the paths of cyclonic storms but does not in itself affect land tem- peratures more than a few miles away.
In central and northern Illinois the isotherms are slightly northeast to southwest in December, January, and February (Figs. 7, 8, and 9), but are more directly east to west in March (Fig. 10). From April thru August (Figs. 11 to 15) the iso- therms are somewhat northwest to southeast in almost all parts of the state. In September (Fig. 16) they are again more east to west except along Lake Michigan, where the direction is almost north and south. By October (Fig. 17) in the northeastern part of the state, the isotherms again have a northeast-southwest trend, which is even more pronounced in November (Fig. 18).
The difference in average temperature between northern and southern Illinois is greater in winter than in summer. During January (normally the coldest month) Cairo averages 36.2°,
1949]
CLIMATE OF ILLINOIS
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CLIMATE OF ILLINOIS
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BULLETIN NO. 532
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1949] CLIMATE OF ILLINOIS 119
and Paducah, Kentucky, 37°. Dubuque, Iowa, and Freeport report average January temperatures of 19.6° and 19.7°, re- spectively. Most of this difference results directly from the latitudinal extent of the state. Latitude has an indirect effect also; for northern Illinois gets more cold air masses from Can- ada than does the southern part of the state, while the region around Cairo gets more air masses from the Gulf of Mexico.
The range between the north and the south is pretty much the same during the other two winter months as in January. At all four stations (Freeport, Dubuque, Cairo, and Paducah) Feb- ruary is about 2l/2 degrees warmer than January. December is about 1 degree warmer than February at Dubuque and Free- port, and is about the same as February in Cairo and Paducah.
The greatest temperature difference in July (usually the hottest month) is not between the extreme south and the north, but between Quincy, with an average temperature of 80.2°, and Waukegan, with an average temperature of 72.3°. As has already been noted, the isotherms at this time have a general north west- to-southeast trend, and Quincy gets some of the highest temper- atures in the state. The difference between Waukegan and Quincy is due primarily to the fact that the conditions at Wau- kegan are partially lake-controlled, whereas the conditions at Quincy are entirely land-controlled.
Since the difference in temperature between the north and the south is smaller in summer than in winter, it follows that spring temperatures rise faster in the north. The rate of change in the different parts of the state may be seen by comparing Figs. 9 thru 12. In March the temperatures begin to rise rapidly all thru the state, but more rapidly in the north than in the south. Temperatures in southern Illinois are almost 10 degrees higher in March than in February, while in northern Illinois March is approximately 12 degrees warmer than February. From March to April a 10-degree increase occurs in southern Illinois and a 10- to 14-degree increase in northern Illinois. From April to May the average increase is 8 to 10 degrees in the south and 10 to 12 degrees in the north. The more rapid increase from month to month in northern Illinois than in southern Illinois results mostly from the difference in latitude. The farther away
120 BULLETIN NO. 532 [April,
an area is from the equator, the more rapidly the days lengthen. Also the air is somewhat drier in the northern part, making for faster heating of the ground and of the air.
From May to June there is an increase of about 10 degrees in the north and 8 to 10 degrees in the south, while from June to July the increase is about 4 to 6 degrees in the north and 2 to 4 degrees in the south. From July to August there is about a 2-degree decrease thruout the state, the decrease being least in the southeastern part.
With the coming of autumn, temperatures drop sharply in all parts of the state, but somewhat more sharply in the north than in the south. From August to September the decrease is from 6 to 8 degrees, with a slightly smaller decrease near Lake Mich- igan. From September to October the temperature drops 10 to 12 degrees thru most of the state and about 10 degrees in the extreme south, while from October to November all parts of the state experience a 10- to 14-degree drop. From November to December the decrease is about 12 degrees in the north and 8 to 10 degrees in the south. The decrease thruout the state con- tinues on to January.
Northern Illinois, with monthly average temperatures in the summer almost as high as those in the south, but with winter temperatures considerably lower, has a greater annual range in temperature than does southern Illinois. Also, temperature ranges are slightly greater in the western part of the state than in the eastern part.
For a more detailed picture of actual temperatures of the state see Table 1 (page 110) and Appendix A (pages 149 to 197).
Yearly variations. Since Illinois climate is characteristically continental, July, on the average, is the warmest month, and January is the coldest (Table 1). During some years, however, June or August, or both, may be warmer than July. Likewise, December or February may sometimes be colder than January (Table 4, Appendix A, pages 150 to 159).
Of a total of 535 Julys recorded at seven different stations (Table 4, Appendix A), only ten Julys had average temperatures the same as the long-time average. Of 530 Januarys, only three
1949] CLIMATE OF ILLINOIS 121
were at the long-time average. This shows how seldom the monthly average in any year coincides with the average taken over a period of years.
According to the data for the seven stations, a few more Julys have been cooler than average than have been warmer than average. The coldest July for the state as a whole was 1891, when the temperature at the seven stations averaged 70.9 V August was also cool that year, July and August combined being the coolest on record at most stations having records dating back that far. In the northern part of the state, July, 1915, was also cool.
At almost all stations in Illinois, July, 1936, was the warmest month on record. With average temperatures in the middle eighties, the state as a whole was 7.1 degrees above normal. Quincy, with an average temperature of 88.0°, was the warmest spot in the state. In commenting upon July, 1936, the U. S. Weather Bureau had this to say :
This month was warmer than any month in the climatological history of Illinois, averaging 1.3° higher than July, 1901, and 2.0° above July, 1934. Temperature in the northern division averaged 0.4° higher than any previous month of record, the central 2.1° higher, and the southern 0.4° higher. Nearly all stations set new absolute maximum temperature records, excepting the extreme south, the extreme west-central, and along Lake Michigan, and the highest temperature ever recorded in the State, 115°, was equalled. The heat wave began on the 4th and did not definitely end until the 29th, maxima daily equalling or exceeding 100° at most of the stations from the 4th to the 17th, and a number of stations had readings of 110° or slightly above on two to four successive days; this consituted by far the most per- sistent and severe heat wave ever officially recorded for the State as a whole.2
The coldest months on record for representative sections of the state have been January, 1912, with an average temperature of 10.5°, and January, 1918, with 11.5° for Chicago; January, 1912, with 3.8° and February, 1875, with 5.5° for Dubuque; January, 1918, with 10.4° and January, 1912, with 11.0° for Peoria; January, 1918, with 13.6° and January, 1940, with 14.5°
1 That the temperatures at these seven stations are representative of the state as a whole is indicated by the fact that the July average for all sixty-four stations for all years of records (thru 1944) was 76.6°, while the average for all the Julys on record at the seven stations was 76.5°.
2 U. S. Department of Agriculture, Weather Bureau. Climatological Data, Illinois Section. July, 1936. p. 25.
122 BULLETIN NO. 532 [April,
for Springfield; January, 1918, with 11.6° and January, 1912, with 13.8° for Urbana; January, 1918, with 21.0°, and January, 1940, with 22.0°, for Cairo; January, 1940, with 17.2°, and Jan- uary, 1918, with 18.8°, for St. Louis. In general, the Januarys of 1912, 1918, and 1940 have been the state's coldest months (see Appendix A, Table 4). Noticeably warmer-than-average Janu- arys occurred in 1880 and 1933.
Absolute Highest and Absolute Lowest Temperatures
The absolute highest temperatures in July, 1936 (the warmest month on record) ranged from 105° at Cairo and Chicago to 115° at Greenville, with Bloomington, Quincy, Mt. Vernon, and Sparta each reporting 114° as the maximum.
The lowest temperature ever recorded in Illinois was — 35° on January 22, 1930, at Mt. Carroll. At other stations the abso- lute lowest temperatures have been recorded during December, January, and February, and during several different years. Some of the most severe December cold spells occurred in the following years: 1872, 1876, 1880, 1901, 1914, 1917, and 1924. Januarys that have had rather severe cold spells were in 1875, 1879, 1884, 1888, 1894, 1912, 1918, 1924, 1930, 1936, and 1940. Februarys having had severe weather were: 1856, 1862, 1866, 1875, 1885, 1886, 1888 (except in the southern part), 1893, 1895, 1899, 1903, 1905, 1917, 1918, 1923, 1929, 1933, and 1936.
In winter, the lowest temperatures are farther below the average than the highest temperatures are above the average; but in summer the opposite is true. Also the greatest differ- ences in temperature within one month have occurred in winter. For example, at Chicago the February difference between the highest and lowest temperatures has been as great as 89 degrees, while in July the greatest difference has been 55 degrees; at Peoria, the differences have been 100 degrees and 67 degrees; at Springfield, 102 degrees and 61 degrees; at Urbana, 95 degrees and 74 degrees; at Cairo, 92 degrees and 50 degrees; and at St. Louis, 102 degrees and 55 degrees.
1949] CLIMATE OF ILLINOIS 123
Differences in Averages Compared With Differences in Extremes
While the difference between the absolute highest and the absolute lowest is greater in winter than in summer, the differ- ence between the average maximum and the average minimum is greater in summer than in winter.
The wide variations in winter are caused primarily by cy- clonic storms and the invasions of warm and cold air masses for relatively short periods of time. Unusually warm masses of air from southern and southwestern United States produce the highest temperatures; and the cold Canadian air masses from the north and northwest produce the lowest temperatures. In summer the climate is controlled more by the sun, which ac- counts for the steady day-to-day differences between the highest and lowest temperatures. There are no marked invasions of cold air and relatively few warm ones to cause extremely wide variations.
Temperature Has Fluctuated But Hasn't Changed
Many people, in Illinois as elsewhere, are convinced that climate has changed within the 'last thirty to fifty years. The "old-fashioned winter," they say, is a thing of the past. Their assertions, however, are based on memory and not on instru- mental records which have been kept very faithfully for almost a century in this state.
Peoria has the longest uninterrupted weather record in Illi- nois, from 1856 to the present. This long record has been used in Fig. 19 (page 124) to show five-year sliding averages of tem- perature for the midmonth of each of the four seasons. The five- year sliding (or moving) average means simply the average of 1856 thru 1860 for the first point on the graph (1858), 1857 thru 1861 for the second point, etc.
Use of the sliding average makes it possible to discount the effects of extreme year-to-year variations without eliminating periodic variations. One really cold January, for example, when averaged in with four others of about normal temperature, will
124
BULLETIN NO. 532
[April,
.
00 OS ni <-H
h o>
1949] CLIMATE OF ILLINOIS 125
cause no one period to stand out as conspicuously cold, but will cause a period of five years to appear graphically as a bit cool. It takes at least two or three cold Januarys during a five-year period to produce a marked drop in the graph line.
The average January temperature in Peoria is 24.3°, with about as many periods slightly above the average as slightly below. Only two periods departed very widely from normal. In the middle 1880's several cool Januarys (1883, 1884, 1885, 1887, and 1888) produced the downward trend; and several warm Januarys (1931, 1932, 1933, and 1938) produced the upward curve in the 1930's.
April, with an average temperature of 50.8°, shows less marked fluctuations than January, with Aprils above or below the normal showing no relationship to January conditions. In other words, a period of colder-than-usual Januarys has not necessarily been followed by Aprils that were either warmer or cooler than normal. There appears to have been no long-time increase or decrease in temperature for this month.
July, with an average temperature of 75.7°, shows less vari- ation from the normal than any other month. There have been two periods of cool and two of warm Julys. The cool periods occurred in the middle 1860's (all Julys except one were below normal), and from 1904 to 1912, when all Julys were below normal. The warm periods occurred in the late 1870's and the middle 1930's. In both of these periods every July was warmer than normal. About as many years were above normal before 1900 as have been since 1900. There appears, therefore, to have been no permanent increase or decrease in July temperatures in Peoria.
October, with an average temperature of 53.3°, likewise shows a fluctuation from one period of years to another, but no definite trend in one direction or the other. Also, the warm or cool October periods show no relation to cool or warm periods during any other month.
In brief, when the long-time temperatures at Peoria are considered, both warmer-than-normal and cooler-than-normal periods can be found, but they do not occur at anything like regular intervals, nor have they been more or less pronounced
126
BULLETIN NO. 532
[April,
of late years. The same thing is true of other long-time stations in Illinois (Appendix A, Table 4). Many factors contribute to temperature, and a variation of any one may easily produce temperatures slightly above or below the normal.
Frost and Growing Season
Variations both in definition of frost and in actual occur- rence often make frost-distribution data more misleading than any other kind of climate data. Frost at some stations means the actual accumulation of hoar frost and at other stations a tem- perature of 32° in an instrument shelter a few feet above the ground or above the roof of a building. Moreover, there is perhaps no other climatic condition which varies so much locally. At times a valley or a low place no deeper than 5 to 30 feet may have a frost several days later than a nearby level place in the
spring, and several days earlier in the autumn. There are not enough weather sta- tions in Illinois to present all the varia- tions in a region.
Fig. 20 does show in a rather general way the varying length of frost-free periods thruout the state. To produce a "frost-free day" map of any great detail it would be necessary to have a network of sta- tions several times as
Distribution of frost-free days. A general northwest- southeast trend is noticeable in the lines which divide the state according to number of frost-free days. (Fig. 20)
I". '. | UNDER 160 160 TO 1.70 170 TO 180 180 TO 190 190 TO 200 OVER 200
1949] CLIMATE OF ILLINOIS 127
dense as that in Illinois. It would also be well to have the sta- tions in the country rather than in cities and towns. Chicago, for example, has a frost-free period of 189 days. Since such a long period in that part of the state seems to reflect the influence of a city rather than conditions in general, Chicago is not indicated on the map.
Hopkins' Bio-Climatic Law is reflected in the trend of the lines indicating the number of frost-free days in Fig. 20. Hop- kins' Law is that in the United States the spring advances, in general, from south to north at the rate of 4 days for 1 degree of latitude, from west to east at the rate of 4 days for 5 degrees of longitude, and from lowland to higher land at the rate of 4 days for 400 feet of altitude. The northwest-to-southeast trend of the lines reflects both latitude and longitude, while the curves in the lines show the effects of altitude. However, the fact that air drainage often causes more frosts in low places than in sur- rounding level areas, at times counteracts the general trend of Hopkins' Law. The result is a patchiness in the distribution of frosts and number of frost-free days.
Table 2 (page 128) shows the average and extreme dates of the earliest and latest frosts at various stations thruout the state, as well as the number of frost-free days.
Disregarding Chicago, with its urban conditions, the aver- age date of the last killing frost of the spring in northern Illinois varies from April 25 at Monmouth and Pontiac (April 19 at Dubuque, Iowa) to May 8 at Mount Carroll. Frost has, how- ever, on at least one occasion, occurred as late as June 8 at both Mount Carroll and Freeport. At Mount Carroll the average date for the first killing frost in autumn is October 5. Altho this is the earliest average date, frost has occurred as early as August 30 at Freeport. Outside Chicago, the average frost-free period in northern Illinois ranges in length from 150 days at Mount Car- roll to 173 days at Aledo and Pontiac (180 days at Dubuque).
In central Illinois the average frost-free period is from 168 to 190 days long, extending from middle or late April to about the middle of October. Killing frosts have, however, occurred as late as the end of May and as early as mid-September.
In southern Illinois the average frost-free period is from 185 to 213 days long. The average date of the last killing frost in spring ranges from March 30 at Cairo to April 17 at Flora,
Table 2.— ILLINOIS FROST DATA: Average and Extreme Dates of
Earliest and Latest Frosts and Length of Frost-Free Periods
at Sixty-Five Weather Stations Thru 1944
|
Length |
Average |
Average |
Latest |
Earliest |
Length of |
|
|
of |
date of |
date of |
date of |
date of |
frost-free |
|
|
Station and county |
record |
last killing |
first killing |
last killing |
first killing |
period |
|
(years) a |
frost in |
frost in |
frost in |
frost in |
(days) |
|
|
spring |
autumn |
spring |
autumn |
|||
|
NORTHERN |
ILLINOIS |
|||||
|
Aledo, Mercer. |
... 44 |
Apr. 26 |
Oct. 16 |
May 25 |
Sept. 20 |
173 |
|
Aurora, Kane |
... 58 |
May 4 |
Oct. 10 |
Mav 31 |
Sept. 16 |
159 |
|
Beloit, Rock, Wis |
... 70 |
Apr. 24 |
Oct. 15 |
May 25 |
Sept. 18 |
174 |
|
Chicago, Cook |
... 74 |
Apr. 15 |
Oct. 21 |
May 25 |
Sept. 20 |
189 |
|
Davenport, Scott, la |
... 73 |
Apr. 20 |
Oct. 16 |
May 22 |
Sept. 18 |
179 |
|
Dixon, Lee |
... 52 |
May 1 |
Oct. 11 |
May 27 |
Sept. 14 |
163 |
|
Dubuque, Dubuque, la |
. .. ,71 |
Apr. 19 |
Oct. 16 |
May 21 |
Sept. 25 |
180 |
|
Freeport, Stephenson |
... 36 |
May 6 |
Oct. 7 |
June 8 |
Aug. 30 |
154 |
|
Galva, Henry |
... 52 |
Apr. 29 |
Oct. 14 |
May 31 |
Sept. 20 |
168 |
|
Henry, Marshall |
... 45 |
Apr. 27 |
Oct. 15 |
May 25 |
Sept. 14 |
171 |
|
Joliet, Will |
... 50 |
May 2 |
Oct. 11 |
May 26 |
Sept. 11 |
162 |
|
Kankakee, Kankakee |
... 28 |
May 1 |
Oct. 14 |
May 26 |
Sept. 20 |
166 |
|
Marengo, McHenry |
... 54 |
May 3 |
Oct. 12 |
May 28 |
Sept. 11 |
162 |
|
Minonk, Woodford |
... 48 |
Apr. 29 |
Oct. 12 |
May 23 |
Sept. 14 |
166 |
|
Monmouth, Warren |
... 51 |
Apr. 25 |
Oct. 14 |
May 25 |
Sept. 20 |
172 |
|
Morrison, Whiteside |
... 42 |
May 1 |
Oct. 12 |
May 27 |
Sept. 11 |
164 |
|
Mt. Carroll, Carroll |
... 47 |
May 8 |
Oct. 5 |
June 8 |
Sept. 12 |
150 |
|
Ottawa, LaSalle |
... 52 |
Apr. 30 |
Oct. 12 |
May 26 |
Sept. 14 |
165 |
|
Pontiac, Livingston |
... 42 |
Apr. 25 |
Oct. 15 |
May 25 |
Sept. 16 |
173 |
|
Rockford, Winnebago |
... 51 |
May 6 |
Oct. 9 |
June 6 |
Sept. 14 |
156 |
|
Sycamore, DeKalb |
... 48 |
May 7 |
Oct. 6 - |
May 27 |
Sept. 11 |
152 |
|
Walnut, Bureau |
... 52 |
. Apr. 28 |
Oct. 13 |
May 25 |
Sept.*14 |
168 |
|
Waukegan, Lake |
... 22 |
May 7 |
Oct. 17 |
May 30 |
Sept. 25 |
163 |
|
CENTRAL ILLINOIS |
||||||
|
Bloomington, McLean |
... 48 |
Apr. 27 |
Oct. 16 |
May 26 |
Sept. 18 |
172 |
|
Carlinville, Macoupin |
... 52 |
Apr. 22 |
Oct. 19 |
May 25 |
Sept. 18 |
180 |
|
Charleston, Coles |
... 47 |
Apr. 24 |
Oct. 16 |
May 26 |
Sept. 14 |
175 |
|
Danville, Vermilion |
... 40 |
Apr. 27 |
Oct. 15 |
May 26 |
Sept. 16 |
171 |
|
Decatur, Macon , |
. .. 51 |
Apr. 24 |
Oct. 18 |
May 25 |
Sept. 16 |
177 |
|
Effingham, Effingham |
... 43 |
Apr. 21 |
Oct. 18 |
May 25 |
Sept. 16 |
180 |
|
Griggsville, Pike |
... 51 |
Apr. 16 |
Oct. 21 |
May 25 |
Sept. 25 |
188 |
|
Havana, Mason |
... 51 |
Apr. 17 |
Oct. 18 |
May 25 |
Sept. 26 |
184 |
|
Hillsboro, Montgomery |
... 48 |
Apr. 21 |
Oct. 20 |
May 25 |
Sept. 24 |
182 |
|
Hoopeston, Vermilion |
41 |
Apr. 30 |
Oct. 15 |
May 25 |
Sept. 16 |
168 |
|
Jacksonville, Morgan |
... 49 |
Apr. 23 |
Oct. 14 |
May 25 |
Sept. 16 |
174 |
|
Keokuk, Lee, Iowa , |
... 73 |
Apr. 12 |
Oct. 13 |
May 7 |
Sept. 18 |
184 |
|
La Harpe, Hancock , |
... 50 |
Apr. 24 |
Oct. 12 |
May 25 |
Sept. 13 |
171 |
|
Lincoln, Logan |
... 50 |
Apr. 28 |
Oct. 15 |
May 26 |
Sept. 18 |
170 |
|
Louisiana, Pike, Mo |
... 47 |
Apr. 23 |
Oct. 11 |
May 25 |
Sept. 13 |
171 |
|
Palestine, Crawford |
... 52 |
Apr. 19 |
Oct. 19 |
May 25 |
Sept. 19 |
183 |
|
Pana, Christian |
... 45 |
Apr. 24 |
Oct. 20 |
May 25 |
Sept. 24 |
179 |
|
Paris, Edgar , |
. .. 51 |
Apr. 27 |
Oct. 21 |
May 26 |
Sept. 24 |
177 |
|
Peoria, Peoria |
, . . . 89 |
Apr. 15 |
Oct. 20 |
May 11 |
Sept. 26 |
188 |
|
Quincy, Adams |
... 33 |
Apr. 13 |
Oct. 20 |
May 25 |
Sept. 22 |
190 |
|
Rushville, Schuyler |
... 47 |
Apr. 20 |
Oct. 19 |
May 25 |
Sept. 22 |
182 |
|
Springfield, Sangamon |
... 65 |
Apr. 15 |
Oct. 19 |
May 25 |
Sept. 25 |
187 |
|
Urbana, Champaign |
... 42 |
Apr. 21 |
Oct. 19 |
May 25 |
Sept. 16 |
181 |
|
White Hall, Greene |
. . . . 48 |
Apr. 21 |
Oct. 19 |
May 25 |
Sept. 22 |
181 |
|
SOUTHERN |
ILLINOIS |
|||||
|
Anna, Union |
... 48 |
Apr. 9 |
Oct. 26 |
May 1 |
Sept. 28 |
200 |
|
Cairo, Alexander |
... 74 |
Mar. 30 |
Oct. 29 |
Apr. 30 |
Sept. 30 |
213 |
|
Carbondale, Jackson |
... 35 |
Apr. 13 |
Oct. 23 |
May 4 |
Sept. 24 |
193 |
|
Du Quoin, Perry |
48 |
Apr. 16 |
Oct. 19 |
May 25 |
Sept. 24 |
186 |
|
Fairfield, Wayne |
. . . . 47 |
Apr. 13 |
Oct. 21 |
May 7 |
Sept. 19 |
191 |
|
Flora, Clay , |
... 45 |
Apr. 17 |
Oct. 19 |
May 25 |
Sept. 15 |
185 |
|
Greenville, Bond |
... 57 |
Apr. 16 |
Oct. 22 |
May 26 |
Sept. 24 |
189 |
|
Harrisburg, Saline |
... 45 |
Apr. 13 |
Oct. 21 |
May 7 |
Sept. 24 |
191 |
|
Mascoutah, St. Clair , |
, . . . 46 |
Apr. 17 |
Oct. 21 |
May 25 |
Sept. 19 |
187 |
|
McLeansboro, Hamilton. ... |
. . . . 48 |
Apr. 16 |
Oct. 22 |
May 7 |
Sept. 19 |
189 |
|
Mt. Carmel, Wabash |
. . . . 40 |
Apr. 14 |
Oct. 23 |
May 25 |
Sept. 26 |
192 |
|
Mt. Vernon, Jefferson |
. . . . 50 |
Apr. 16 |
Oct. 22 |
May 14 |
Sept. 15 |
189 |
|
New Burnside, Johnson , |
, . . . 34 |
Apr. 17 |
Oct. 21 |
May 8 |
Sept. 24 |
187 |
|
Olney, Richland |
. . . . 48 |
Apr. 17 |
Oct. 20 |
May 25 |
Sept. 18 |
186 |
|
Paducah, McCracken, Ky.. . |
. . . . 16 |
Apr. 7 |
Oct. 24 |
Apr. 23 |
Oct. 7 |
200 |
|
St. Louis (no county), Mo.. . |
, . . . 72 |
Apr. 2 |
Oct. 30 |
May 22 |
Sept. 28 |
211 |
|
Sparta, Randolph |
... 43 |
Apr. 13 |
Oct. 22 |
May 7 |
Sept. 14 |
192 |
|
Vincennes, Knox, Ind |
51 |
Apr. 13 |
Oct. 23 |
May 25 |
Sept. 23 |
193 |
• For each station the averages are based on the number of years that records of frosts had been kept thru 1944.
1949] CLIMATE OF ILLINOIS 129
Mascoutah, New Burnside, and Olney. In autumn the average date of the first frost is October 19 at Flora and Du Quoin and October 29 at Cairo. The last frost in the spring has been as late as April 30 at Cairo (April 23 at Paducah, Kentucky) and May 26 at Greenville, while the first killing frost in the autumn has occurred as early as September 14 at Sparta and September 30 at Cairo (October 7 at Paducah).
During some years the first autumn frost may occur on the same day thruout the state because of an invasion of a mass of cold Canadian air. Similarly, in the spring a final invasion of cold air may cause the last frost to come at the same time all thru Illinois.
PRECIPITATION
Precipitation, as treated in this bulletin, includes rain and melted snow, sleet, and hail. However, snow makes up consid- erably less than 10 percent of the total precipitation, and the percentage due to sleet and hail is almost negligible.
Precipitation results from the expansion and cooling of air which is forced to ascend. This is caused by (1) thermal con- vection (up-and-down movement of the air due to varying tem- perature) and (2) conflicting air masses associated with cyclonic storms. Precipitation caused by thermal convection usually oc- curs in late spring, summer, and early fall, while that due to conflicting air masses is commonest in the cool part of the year.
Convection results when the surface air over a large area is heated to such a degree that it becomes lighter than the air above. The colder, heavier air above will then descend and force the warm surface air up, causing it to expand and cool. Convec- tion may also result when one area is heated more than sur- rounding areas. Both types of convection cause local showers, with a maximum of precipitation and a minimum of cloudiness.
Cyclonic precipitation, or that caused by conflicting air masses (Figs. 2 and 5), often covers large continuous areas and is likely to produce steady precipitation lasting longer than that due to convection. Cyclonic precipitation is often associated with a complete cloud cover, which sometimes lasts for days.
In considering the agricultural utility of a region, one is sure to ask three questions about precipitation : ( 1 ) How much does
130
BULLETIN NO. 532
[April,
the place receive? (2) How is the precipitation distributed thru the year? (3) How dependable is it from year to year?
Amount of Precipitation
Average annual precipitation in Illinois varies from 30.77 inches at Morris to 47.43 inches at Anna. However, in 1945 Carbondale had 74.50 inches and in 1887 Pontiac had only 16.15 inches. These are the greatest and the least annual amounts on record in the state.
For geographic distribution of average annual precipitation see Fig. 21. An interval of only 2 inches of precipitation between the isohyets (lines of equal rainfall), as well as differences in the periods of observation at the various stations, may possibly account for some of the minor variations in the lines. However, the decrease in amount of precipitation from the Ozarks north- ward is natural.
In general, the western part of the Illinois Ozarks has the most precipitation, and the northern part of the state the least amount. The greater winter precipitation in southern Illinois than in the north is most responsible for the an- nual difference. South- ern Illinois has more cyclonic activity in winter than does any other part of the state. Also, its greater prox-
Distribution of average annual precipitation. There is an irregular but definite decrease in precipitation from south to north in Illi- nois. (Fig. 21)
. UNDER 34IN. TO 36'IN. To 38 'N. ES338 TO 40 IN. 40 TO 42 IN. TO 44 IN. 44 TO 46 IN ,,.B3BOVE« 46 IN.
1949] CLIMATE OF ILLINOIS 131
imity to the Gulf of Mexico, along with the cyclonic activity, makes for heavy spring rains.
For detailed information on precipitation in Illinois see Ap- pendix B, Tables 9, 10, and 11, pages 199 to 294.
Distribution Thruout the Year
Fig. 22, page 132, shows graphically the amount of precipita- tion each month at fifteen representative Illinois stations. For monthly and seasonal distribution of precipitation thruout the state see Figs. 23 thru 38. These maps are based on data thru December 31, 1944. The conventional months of December, January, and February have been used for winter; March, April, and May, for spring; June, July, and August, for summer; and September, October, and November for autumn. The %-inch interval for isohyets on the monthly maps and the 1-inch in- terval used for the seasonal maps reveal minor local irregularities in amount of precipitation.
The growing season (April to September) is the period of maximum precipitation in all of Illinois save a small area in the southern part (Fig. 39). Mount Carroll, with 66.9 percent of the precipitation during the growing season, and Cairo and Shaw- neetown, each with 49.2 percent, represent the extremes.
In general, the northern part of the state gets a larger per- centage of its total precipitation during the growing season than does the southern part. This tends to make the annual precipita- tion in northern Illinois as effective agriculturally as the heavier annual amount in southern Illinois. That the total growing- season precipitation is much the same thruout the state is shown by the following data taken from six representative weather stations :
Amount of precipitation Percentage of total during growing season precipitation during
Station (inches) growing season
Aledo 22.89 66.8
Morris 19.05 61.9
Clinton 23.77 61.1
Roberts 20.38 61.4
Anna 24.75 52.6
Cairo . 20.16 49.2
132
BULLETIN NO. 532
[April,
AVERAGE
MONTHLY
PRECIPITATION
Average monthly precipitation, in inches, at fifteen representative stations in Illinois. While total precipitation is less in northern Illinois than in the southern part of the state, precipitation during the growing season is about the same.
(Fig. 22)
1949]
CLIMATE OF ILLINOIS
133
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1949] CLIMATE OF ILLINOIS 139
Wettest months. At most stations in Illinois the month of maximum precipitation is either June, May, or March, altho at a few scattered points September and April have the most rain- fall. In southern and southeastern Illinois (Fig. 40) March is the wettest month, with January, April, or June as second and one of the other two months third. In the major portion of the state May is usually the wettest; June, September, or April is second; and one of the other two months is third. In the west- central and northern part June is almost without exception the wettest month. Either May or September is second and the other of these two months is third.
Driest months of growing season. At no place in Illinois is either May or June the driest month of the growing season. Each of the other four months, however, appears as the driest month with varying degrees of frequency.
At twenty-four stations on and north of a line drawn from Keokuk, Iowa, to Chicago, April is the driest month of the growing season. April is also driest, by .01 inch, at Watseka to the south of the line, but north of the line there are Elgin, Joliet, La Salle, Oregon, and Pawpaw, where July is driest.
At six stations in and to the northwest of the Illinois river valley, extending from Peoria to Griggsville, August is the driest month of the growing season. Also August is the driest month in Charleston and White Hall and (by .01 inch) in Hoopeston. In the extreme southern part such stations as Cairo, Golconda, and Paducah, Kentucky, as well as Du Quoin, Flora, Salem, and St. Louis, Missouri, have least precipitation in September.
July is the driest month of the growing season at the other fifty-four stations, as well as at the five already mentioned (Elgin, Joliet, La Salle, Oregon, and Pawpaw). The general dry- ness of this month often reduces crop yields.
Dependability of Precipitation
As a whole, the precipitation of Illinois is quite dependable from year to year. To be sure, dry periods and dry years as well as wet periods and wet years occur, but the departures from normal are neither great nor frequent for a continental climate like that of Illinois.
140 BULLETIN NO. 532 [April,
Driest and wettest years. In Appendix B (pages 199-294) the monthly and annual precipitation is given for 100 stations (90 in Illinois and 10 in adjoining states) for as long as records have been kept at these stations. The driest year on record at any of the 100 stations was 1887 at Pontiac. Precipitation was 49 percent of normal. At Pawpaw the driest year was 1922, when precipitation was 74 percent of the average annual amount. Driest years at other stations ranged between these two in percentage of normal precipitation, with the average precipitation of the driest years at all 100 stations averaging 65 percent of normal.
Precipitation during the wettest years on record at any of these stations ranged from 127 percent of the annual average at Morris (1942), to 175 percent (1858) at St. Louis. Average precipitation for the wettest years at all stations was 149 percent of normal.
The above averages of the driest years and the wettest years are of course made up of different years. For several reasons it would be quite misleading to select any one year as the driest or the wettest year in the state as a whole. For one thing, most stations whose records are used in this bulletin have interrupted records, thus not reporting during years when other stations might be reporting their wettest or driest year. In the second place, some of the records do not extend back very far. The shorter the period of years on record, in general, the smaller the variation in any climatic element. In the third place, a very heavy rainfall may occur during some summer day at one station but not at any of the surrounding ones. Thus one station might have an annual maximum one year, while nearby stations might have greater rainfall in other years.
Despite the variations from station to station, a few general- izations can be made concerning driest and wettest years. In northern Illinois (for climatological divisions of state, see Fig. 1) 1902 was the wettest year on record at 12 of the 33 stations and the second wettest since 1900 at 5 others, while at 10 stations there were no reports for 1902. In central Illinois, with its 38 stations, 1927 was wettest at 19 stations and second wettest at 3 stations. At Watseka and at Burlington, Iowa, both near the northern margin of central Illinois, 1902 was wettest, placing
1949] CLIMATE OF ILLINOIS 141
them within the northern Illinois group, while at Palestine, near the southeastern portion of central Illinois, 1945 was the wettest year. This places it within the southern Illinois group, for 1945 was the wettest year on record at 16 of the 29 stations in the southern third of the state, and was the wettest year of the present century at Golconda and Sparta. Four stations in south- ern Illinois reported 1945 as the second wettest year since 1900, and 5 stations as the third wettest. In general, 1902 was the wettest year on record in northern Illinois, 1927 in central Illi- nois, and 1945 in southern Illinois.
Division of the state on the basis of driest years does not coincide quite so closely with the division given in Fig. 1. Should a line be drawn westward, beginning about midway between Kankakee and Watseka, passing south of Pontiac and Minonk but north of Peoria and Fairview, thence south, west of Havana, east of Jacksonville, west of White Hall, and east of Grafton, the area to the north and west would be generally found to have had its least annual precipitation in 1901. Naturally several exceptions occurred, but where 1901 was not driest, the differ- ence between that year and the driest reported was generally very small.
Should another line be drawn westward from about midway between Casey and Palestine and between Effingham and New- ton, south of Greenville, and north of Edwardsville, the portion of Illinois to the south would be generally found to have had the least annual precipitation in 1936. At 18 of the 29 stations 1936 was either driest or second driest. In central Illinois, or that portion of the state between the lines described above, all sta- tions except Peoria reported 1914 as driest or as second or third driest.
In general, 1901 was the driest year in northern Illinois, 1914 the driest in the central part of the state, and 1936 the driest in the south.
Wet and dry growing seasons. In Appendix C (pages 295 to 363) growing season precipitation is given by 10-day inter- vals for 1921 thru 1946. Analysis of these data on a year-to-year basis reveals that (1) the precipitation was above average in about half of the years and below average during the other half
142 BULLETIN NO. 532 [April,
of the years; (2) the greatest positive departure was slightly larger than the greatest negative departure; and (3) the great- est departures each way were in southern Illinois.
Precipitation during the driest growing seasons at the sixty- six stations during the 1921-1946 perio'd averaged 58 percent of normal. (This average is based on the one driest growing season on record at each station, regardless of year.) The wettest grow- ing seasons during the same period received 151 percent of the annual precipitation.
The average precipitation during the wettest 10-day periods (including the wettest period for every year of the 26-year period at each station) varied only slightly in the different sections of the state. Averages were 1.74 inch in northern Illi- nois, 1.78 inch in central Illinois, and 1.75 inch in southern Illinois. Average precipitation in the driest 10-day periods varied a little more. In northern Illinois the average was .71 inch, in central Illinois .79 inch, and in southern Illinois, .77 inch.
When the one wettest period on record at each station in northern Illinois is considered, the average for all the stations in the area is shown to be 7.01 inches. This average is made up of such differences as 9.39 inches between August 11 and 20, 1924, at Galva, and 5.33 inches between September 11 and 20, 1936, at Morris. In central Illinois the average was 8.45 inches, with extremes of 11.09 inches at Springfield between September 1 and 10, 1926, and 5.71 inches at Roberts from July 21 to 31, 1926 (11 days). In the southern part of the state the average was 8.74 inches, with Nashville reporting 16.55 inches between August 11 and 20, 1946, and Grand Chain reporting 6.33 inches between August 1 and 10, 1946.
Since every station included in Appendix C had at least one 10-day period with no precipitation, the average for the driest 10-day periods was 0 thruout the state.
No long-time change in amount of precipitation. Not only are year-to-year variations from the average annual precipita- tion comparatively small, but they show no permanent increase or decrease in amount of precipitation. Fig. 41, for example, shows that in Peoria (where the average annual precipitation is 35.01 inches) there have been three periods of conspicuously
|
1949] CLIMATE OF ILLINOIS |
Peoria precipitation variations. For each year annual precipitation is given both as a total and as a five-year sliding average. Also five-year sliding averages are given for each season. (The five-year sliding average for 1858 is the average of the yearly — • precipitation for 1856 thru 1860; that for 1859 is the average of 1857 thru 1861, etc.) Note the fluctuations without a permanent £> change. (Fig. 41) |
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144
BULLETIN NO. 532
[April,
O -Q
1949] CLIMATE OF ILLINOIS 145
heavy precipitation. These were from the middle 1870's to the early 1880's; during the early 1900's; and during the late 1920's. Dry periods have also occurred, but these are less conspicuous than the wet periods. The lower part of the graph shows the seasons responsible for unusually heavy or light annual precipi- tation. For example, the peak of heavy annual precipitation in the early 1900's resulted from heavy summer rains, while summer and autumn precipitation produced the peak in the late 1020*8.
Fig. 42 gives the same information for Cairo that Fig. 41 does for Peoria. A comparison of the two graphs shows that (1) fluctuation was greater in Cairo, (2) the early 1880's and the late 1920's were rainy periods at both places, (3) the early 1900's were dry at Cairo but wet at Peoria, and (4) there was no definite period of years between wet spells and dry spells at either place. After about 1933 there was a general decrease in precipitation at Cairo, but 1945 and 1946 precipitation was con- siderably above the annual average.
Other long-record stations in and near Illinois, like Peoria and Cairo, show rather marked fluctuations, but no definite periodicity and no permanent change.
Snowfall
Snowfall gets into the precipitation records in two ways. First, the amount is measured in inches or fractions thereof, and is recorded to make up the total amount of snowfall per month or per year. Second, the snow is melted to determine its water equivalent. In its melted form it is included in the total pre- cipitation.
Table 3 and Fig. 43, pages 146 to 148, are based on the rec- ords of snowfall in its unmelted form. They show the geographi- cal distribution of snowfall in Illinois. This distribution reflects the north-to-south extent of the state, the amount of snowfall in- creasing fairly uniformly from just less than 10 inches in the extreme south to slightly more than 35 inches in the north- western part (represented by Dubuque, Iowa).
July and August are the only months in which snow has not been reported in some part of Illinois, altho only Aurora and
146
BULLETIN NO. 532
[April,
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tn i— i O PH |
ON^HOC<l'-l'-iOaOC<5C<3'*OOCOiMOi-HiOTfit»O |
en 1— ( 0 |
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nJ s H |
ioiO'*T(<meo'*c<5iocDij< •^<ot~-^>ncD>noooooM |
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ALL: Average Monthlj |
1-5 "°_" tSl'S ill QJ (-(>*» H |
s O fe |
tOOOO>OOOOt~t-SOt^t^5Ot-OOOOt~t»OOOt-!OOO TftooOiONoi^oO'-ioO'-'ooc'o-HcnfrjiMMe^iN TjiuScOiOWOrtiuJC^iOTjilOTtntSiCKN^ifOiOiM |
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|
Table 3.— ILLINOIS SNOWF |
Station and county |
M; IU i|3Jj (rt f*l PfjMlii^ifF^Mi 5fl1ftSlffl|l^i||l!i isiiiiiiiiiii-iiiiyi ^l65l5«33Ma2saaS«2l«lfi^&: |
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1949]
CLIMATE OF ILLINOIS
147
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148
BULLETIN NO. 532
Chicago have reported a trace in June. The months of heaviest snowfall in northern and central Illinois are January, February, and December in that order, while in southern Illinois the order is February, January, and December.
|~ "1 10 TO 15IN.
15 TO 20IN. KSN20TO 25 IN.
25 TO 30 IN.
30 TO 35 IN.
OVER 35 IN.
Average annual snowfall distribution. As is to be expected, the amount of snow increases rather uniformly from south to north. (Fig. 43)
APPENDIX A
DETAILED TEMPERATURE DATA
The five tables in this Appendix give detailed temperature data for five long-record stations in Illinois and for Dubuque, Iowa, and St. Louis, Missouri, which are roughly representative of nearby areas in Illinois. All the records are thru 1946, and ex- tend back as far as data are available for the various stations. Measurements are given in degrees Fahrenheit.
Index to Weather Stations
Average monthly and annual temperatures (Table 4)
Page Page
Chicago 150 Urbana 155
Dubuque 151 Cairo 156
Peoria 153 St. Louis 158
Springfield 154
Average maximum monthly and annual temperatures (Table 5)
Chicago 160 Urbana 165
Dubuque 161 Cairo 166
Peoria 162 St. Louis 167
Springfield 163
Average minimum monthly and annual temperatures (Table 6)
Chicago 169 Urbana 174
Dubuque 170 Cairo 175
Peoria 171 St. Louis 176
Springfield 172
Monthly and annual highest temperatures (Table 7)
Chicago 178 Urbana 183
Dubuque 179 Cairo 184
Peoria 181 St. Louis 186
Springfield 182
Monthly and annual lowest temperatures (Table 8)
Chicago 188 Urbana 193
Dubuque 189 Cairo 194
Peoria 191 St. Louis 196
Springfield 192
149
150 BULLETIN NO. 532 [April,
Table 4. — Average Monthly and Annual Temperatures (° Fahrenheit)
Year Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Annual CHICAGO, Cook county
|
1871 |
. . 30 2 |
31.8 |
41 1 |
51 1 |
58 5 |
68 7 |
72 5 |
72 3 |
61 1 |
50 2 |
34 3 |
20 8 |
49 4 |
|
1872 ... |
22.5 |
25.4 |
28.0 |
47.7 |
57.0 |
70.5 |
72 5 |
72 0 |
64 2 |
50 9 |
32 3 |
18 5 |
46 8 |
|
1873.... |
19.3 |
23.7 |
32.3 |
43.1 |
52.9 |
69.5 |
69.3 |
71.6 |
63.2 |
50.3 |
34 9 |
32 1 |
46 8 |
|
1874 |
. . . . 27 . 8 |
30.6 |
36 4 |
39.2 |
59 0 |
71 6 |
75 3 |
73 2 |
67 7 |
54 4 |
40 7 |
32 9 |
50 7 |
|
1875.... |
15.8 |
14.7 |
31.0 |
43.6 |
55.3 |
64.2 |
69.3 |
68 5 |
61 5 |
48 8 |
37 3 |
36 1 |
45 5 |
|
1876... |
. . 32.5 |
32.0 |
34.0 |
47*. 8 |
60.2 |
69.2 |
74.7 |
74.6 |
62.4 |
50.1 |
40 2 |
19 5 |
49 8 |
|
1877.... |
22.1 |
37.4 |
28.9 |
47.0 |
58.0 |
68.1 |
74 1 |
72 4 |
67 4 |
56 3 |
40 7 |
43 5 |
51 3 |
|
1878 |
31.5 |
36.5 |
45.2 |
52.8 |
56.0 |
66.5 |
75.8 |
74.7 |
66.8 |
53 5 |
44 7 |
23 9 |
52 3 |
|
1879 |
. .20.9 |
27.1 |
40 6 |
47 8 |
58 6 |
65 5 |
76 1 |
72 9 |
61 6 |
61 5 |
43 1 |
31 2 |
50 6 |
|
1880 |
... 39 . 5 |
34.9 |
38.4 |
49.6 |
65.8 |
71.8 |
73 7 |
73 3 |
63 5 |
52 1 |
32 3 |
24 1 |
51 6 |
|
1881 |
19 1 |
25.1 |
32 4 |
42 2 |
61 8 |
64 4 |
73 8 |
76 0 |
70 8 |
56 '9 |
40 8 |
37 8 |
50 1 |
|
1882 |
. . . . 28 . 3 |
39.1 |
39 6 |
46.4 |
52 2 |
65 2 |
69 3 |
72 0 |
65 6 |
58 7 |
43 3 |
26 7 |
50 5 |
|
1883 |
16.1 |
22.7 |
32.0 |
47.3 |
53.8 |
65.7 |
71.1 |
68.4 |
61 2 |
53 0 |
42 9 |
31 1 |
47 1 |
|
1884 |
.. 18.5 |
27 9 |
34 2 |
44 7 |
56 9 |
65 4 |
69 1 |
68 9 |
69 4 |
57 1 |
41 7 |
30 1 |
48 7 |
|
1885 |
. . . 18.3 |
17.9 |
31.3 |
46.7 |
54.2 |
66 6 |
73 7 |
69 0 |
65 0 |
52 3 |
43 4 |
31 9 |
47 5 |
|
1886... |
. . 22.1 |
29.5 |
37.2 |
50.1 |
58.0 |
67.4 |
72.3 |
73.2 |
66 6 |
57.7 |
39.1 |
25 4 |
49 9 |
|
1887 |
... 16.8 |
26.9 |
33 1 |
49 3 |
60 3 |
67 5 |
75 2 |
69 3 |
63 2 |
48 1 |
37 2 |
27 3 |
47 8 |
|
1888.. ., |
... 15.2 |
23.5 |
30.8 |
47.0 |
53.4 |
67.3 |
72 5 |
70 1 |
60 7 |
50 0 |
42 6 |
32 8 |
47 2 |
|
1889 |
. . . 29.4 |
20.8 |
39.3 |
47.4 |
57.1 |
62.4 |
70.4 |
71.3 |
63.7 |
50 3 |
39 6 |
41 2 |
49 4 |
|
1890 |
. 31.2 |
33.0 |
30.2 |
46 5 |
54 1 |
71 0 |
72 4 |
68 1 |
61 0 |
52 0 |
42 5 |
31 1 |
49 4 |
|
1891... |
. . 30.5 |
29.2 |
31.3 |
47.9 |
54.1 |
66.5 |
67.3 |
69 5 |
69 6 |
53 2 |
34 2 |
35 9 |
49 1 |
|
1892 |
19 8 |
30 8 |
31 7 |
44 9 |
53 1 |
65 2 |
71 9 |
71 4 |
64 5 |
54 2 |
35 3 |
23 9 |
47 2 |
|
1893 |
... 12.3 |
22.1 |
33.9 |
45 2 |
53 1 |
68 6 |
74 1 |
70 3 |
64 7 |
53 2 |
36 6 |
25 9 |
46 7 |
|
1894.... . |
. . . 27.8 |
23.6 |
41.9 |
47.7 |
56.8 |
72.2 |
73 7 |
71 3 |
66 8 |
52 7 |
35 0 |
32 9 |
50 2 |
|
1895 |
. . . 17.9 |
17.6 |
32.4 |
47.2 |
59.9 |
71.0 |
70.5 |
72.9 |
69.2 |
46.8 |
37 1 |
30 1 |
47 7 |
|
1896... |
. . 27.3 |
27.2 |
31.9 |
54.3 |
66 2 |
67 8 |
72.5 |
73 3 |
61 2 |
50 2 |
39 0 |
33 4 |
50 4 |
|
1897 |
... 22.1 |
29.2 |
35.4 |
46.9 |
55.7 |
66.0 |
74 5 |
69 5 |
70 1 |
59 0 |
39 3 |
25 5 |
49 4 |
|
1898 |
... 28.9 |
28 2 |
41 1 |
45 3 |
56 9 |
69 6 |
73 7 |
71 9 |
68 2 |
51 2 |
37 6 |
24 8 |
49 8 |
|
1899 |
... 23.3 |
18.5 |
30.5 |
50.9 |
59 7 |
70 7 |
72 5 |
74 0 |
63 3 |
58 6 |
45 4 |
27 7 |
49 6 |
|
1900 |
. . . 29.0 |
20.7 |
29.7 |
47.7 |
58.8 |
64.8 |
71 9 |
76 8 |
66 2 |
62 0 |
39 0 |
30 5 |
49 8 |
|
1901 |
... 26.3 |
17.6 |
34.7 |
45 9 |
54 8 |
69 9 |
77 7 |
72 1 |
64 9 |
56 0 |
38 2 |
24 5 |
48 6 |
|
1902 |
... 25 . 3 |
21.4 |
39.3 |
47.3 |
59 7 |
65 0 |
72 7 |
68 9 |
61 4 |
55 8 |
47 6 |
27 0 |
49 3 |
|
1903 |
24 3 |
25 6 |
41 1 |
48 1 |
60 5 |
62 0 |
72 5 |
68 9 |
65 0 |
54 2 |
37 0 |
20 5 |
48 3 |
|
1904 |
... 18.0 |
17.8 |
35 9 |
41 6 |
58 0 |
65 0 |
71 3 |
68 8 |
65 1 |
54 0 |
43 4 |
27 3 |
47 2 |
|
1905 |
. . . 18.4 |
17.6 |
39.9 |
46.4 |
57.1 |
66 2 |
69 8 |
72 8 |
66 4 |
52 3 |
39 5 |
30 6 |
48 1 |
|
1906 |
31.2 |
26 5 |
29 2 |
49 9 |
58 8 |
67 1 |
70 2 |
74 4 |
69 0 |
51 7 |
40 7 |
31 6 |
50 0 |
|
1907. ... |
. . . 26.4 |
25.3 |
41.6 |
39 0 |
50 6 |
65 3 |
71 9 |
70 0 |
63 5 |
51 5 |
39 9 |
31 6 |
48 0 |
|
1908 |
27 2 |
25 6 |
39 6 |
48 2 |
57 7 |
67 5 |
72 9 |
72 2 |
69 5 |
54 1 |
42 4 |
30 1 |
50 6 |
|
1909 |
. . . 27.4 |
31 3 |
35 0 |
44 2 |
54 9 |
65 7 |
70 9 |
73 6 |
62 9 |
49 5 |
47 4 |
20 4 |
48 6 |
|
1910 |
... 24 . 2 |
23.7 |
47.6 |
50 4 |
52 4 |
67 3 |
74 6 |
72 1 |
64 1 |
57 5 |
34 9 |
25 2 |
49 5 |
|
1911 |
27 8 |
31 3 |
38 2 |
45 3 |
64 9 |
71 5 |
74 6 |
70 6 |
65 9 |
52 1 |
34 3 |
33 8 |
50 9 |
|
1912 |
... 10.5 |
20.7 |
27 8 |
48 0 |
58 9 |
65 1 |
71 5 |
69 8 |
66 6 |
54 7 |
41 7 |
32 2 |
47 3 |
|
1913 |
.. . 27.9 |
23.7 |
34.2 |
48.0 |
56 6 |
69 6 |
73 5 |
73 1 |
64 3 |
52 2 |
46 1 |
36 2 |
50 5 |
|
1914 |
. . . 31.0 |
19 1 |
34 7 |
47 5 |
61 3 |
69 3 |
73 6 |
73 0 |
65 5 |
58 3 |
43 3 |
22 9 |
50 0 |
|
1915 |
... 22 . 7 |
33.4 |
33 8 |
55 5 |
53 1 |
62 9 |
68 8 |
65 4 |
66 1 |
55 3 |
43 1 |
27 9 |
49 0 |
|
1916 |
27 4 |
23 9 |
33 6 |
47 2 |
58 3 |
62 6 |
77 0 |
75 4 |
63 3 |
53 3 |
42 1 |
24 8 |
49 1 |
|
1917 |
. . . 22.8 |
18.7 |
37 8 |
44 0 |
51 6 |
62 9 |
70 8 |
69 2 |
62 6 |
43 9 |
41 9 |
21 2 |
45 6 |
|
1918 |
. . . 11.5 |
26.0 |
41.2 |
43.1 |
62 6 |
66 0 |
70 0 |
74 8 |
58 0 |
55 8 |
42 0 |
36 2 |
48 9 |
|
1919 |
... 29 4 |
29 6 |
37 4 |
47 4 |
54 1 |
72 0 |
75 4 |
71 6 |
67 2 |
56 2 |
38 2 |
20 2 |
49 9 |
|
1920 |
. . . 17.5 |
24.6 |
39 1 |
42 1 |
54 0 |
67 6 |
70 0 |
69 4 |
68 2 |
60 4 |
39 1 |
31 4 |
48 6 |
|
1921... . |
... 31 6 |
32 6 |
45 4 |
53 6 |
60 6 |
73 2 |
79 4 |
71 6 |
68 4 |
54 0 |
40 0 |
31 7 |
53 5 |
|
1922 |
. . . 23.5 |
28 7 |
38 6 |
48 0 |
63 2 |
70 0 |
72 0 |
71 8 |
68 4 |
56 9 |
43 4 |
28 7 |
51 1 |
|
1923 |
. 29 9 |
20 8 |
32 2 |
45 7 |
53 5 |
69 9 |
72 8 |
70 0 |
65 0 |
51 4 |
42 8 |
38 6 |
49 4 |
|
1924 |
... 18.0 |
27 3 |
33 6 |
48 0 |
53 1 |
63 6 |
68 7 |
70 0 |
59 3 |
58 8 |
40 8 |
22 2 |
47 0 |
|
1925 |
. . . 24.0 |
30.6 |
38 4 |
52 0 |
53 8 |
70 8 |
71 4 |
71 8 |
70 0 |
44 3 |
38 0 |
24 0 |
49 1 |
|
1926... |
. . . 26.4 |
30 9 |
30 2 |
42 0 |
58 4 |
63 4 |
71 i |
72 0 |
64 4 |
52 4 |
37 0 |
26 6 |
47 9 |
|
1927 |
. . . 24.8 |
35.0 |
42 0 |
47 8 |
56 8 |
64 8 |
71 7 |
66 7 |
69 0 |
58 0 |
43 2 |
26 9 |
50 6 |
|
1928 . . |
... 25 2 |
30 3 |
36 9 |
44 7 |
58 2 |
63 0 |
72 8 |
72 2 |
61 4 |
56 5 |
42 2 |
32 2 |
49 6 |
|
1929 |
... 17.6 |
21 6 |
43 2 |
51 1 |
56 8 |
64 4 |
73 8 |
70 6 |
64 6 |
53 1 |
36 3 |
28 6 |
48 5 |
|
1930. . . |
.. 20.1 |
37.1 |
36.1 |
49.2 |
61.2 |
70.1 |
74.2 |
73.4 |
fifi 9 |
51 6 |
42 4 |
29 7 |
si n |
1949] CLIMATE OF ILLINOIS: APPENDIX A 151
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. |
May June . July |
Aug. |
Sept. |
Oct. |
Nov. |
Dec. |
Annual |
|
CHICAGO, Cook county, |
concluded |
||||||||||
|
1931 |
32 0 |
35 6 |
34 8 |
49 2 |
55.6 71 8 76.4 |
73.2 |
71.2 |
58.8 |
50.0 |
38.4 |
53.9 |
|
1932 |
. . 33.6 |
35.0 |
30.1 |
46.4 |
59.6 70.6 74.7 |
73.7 |
64.4 |
52.6 |
37.2 |
28.8 |
50.6 |
|
1933 |
36 7 |
26 2 |
35 4 |
46 8 |
60 0 76 2 75 6 |
71 4 |
69 8 |
52 8 |
38.0 |
31.3 |
51.7 |
|
1934 |
. 32.3 |
22.9 |
32.9 |
48.6 |
65.2 71.6 76.6 |
72.4 |
64.2 |
56.0 |
45.8 |
26.2 |
51.2 |
|
1935 |
. 25.6 |
29.6 |
41.3 |
44.0 |
52.0 65.1 76.8 |
73.4 |
65.8 |
54.2 |
39.6 |
25.2 |
49.4 |
|
1936... |
. 19.0 |
15.2 |
39.6 |
43.6 |
64.4 64.6 76.8 |
75.0 |
68.2 |
53.6 |
38.0 |
34.0 |
49.3 |
|
1937 |
. . 26.9 |
26.4 |
32.8 |
46.5 |
57.9 65.9 74.4 |
75.7 |
65.1 |
51.2 |
37.4 |
26.6 |
48.9 |
|
1938 |
25 4 |
34 6 |
45 0 |
50 2 |
58 3 67 6 73 8 |
75.0 |
65.0 |
58.8 |
43.6 |
29.2 |
52.2 |
|
1939 |
. 31.6 |
27.6 |
38.2 |
45.2 |
61.4 70.8 74.0 |
72.6 |
70.0 |
56.0 |
41.6 |
35.0 |
52.0 |
|
1940 |
. 16.2 |
29.2 |
32.2 |
44.6 |
54.1 67.4 74.2 |
72.0 |
64.6 |
57.4 |
38.6 |
33.5 |
48.9 |
|
1941... |
. 28.1 |
25.6 |
32.0 |
52.7 |
62.4 69.4 73.7 |
73.6 |
68.8 |
56.9 |
43.2 |
36 4 |
51.9 |
|
1942 |
. 25.6 |
26.5 |
39.6 |
53.9 |
59.5 68.2 75. 2» |
72.4 |
62.4 |
53.3 |
40.9 |
23.0 |
50.0 |
|
1943 |
. 22.6 |
27.8 |
32.2 |
45.6 |
56.6 72.2 75.7 |
75.0 |
61.6 |
53.7 |
36.2 |
27.6 |
48.9 |
|
1944 |
. 31.4 |
29.0 |
32.3 |
45.3 |
64.4 72.8 74.2 |
74.1 |
66.2 |
53.4 |
42.7 |
22.0 |
50.6 |
|
1945 |
. 19.2 |
28.8 |
48.6 |
49.8 |
54.1 65.4 72.0 |
72.0 |
64.0 |
51.4 |
39.8 |
22.2 |
48.9 |
|
1946 |
. 26.7 |
28.6 |
47.2 |
51.1 |
56.9 68.3 74.6 |
69.9 |
65.6 |
58.5 |
42.4 |
31.9 |
51.8- |
|
Aver |
24.6 |
26.8 |
36.2 |
47.2 |
57.6 67.7 73.1 |
71.8 |
65.3 |
53.9 |
40.2 |
29.0 |
49.4 |
|
DUBUQUE, Dubuque county, Iowa |
|||||||||||
|
1851... |
. 23.5 |
31.1 |
41.9 |
48.1 |
60.6 67.7 75.0 |
67.5 |
67.7 |
49.5 |
31.6 |
21.6 |
48.8 |
|
1852 |
. 21.1 |
28.3 |
32.8 |
41.9 |
59.6 67.9 73.2 |
70.6 |
59.6 |
54.3 |
30.6 |
23.1 |
46.9 |
|
1853 |
22.7 |
34.4 |
47.6 |
72.4 69.4 |
71.4 |
63.6 |
46.6 |
38.2 |
26.6 |
||
|
1854 |
. 15.4 |
28.1 |
39.2 |
52.0 |
60.7 70.2 77.3 |
74.7 |
68.2 |
56.6 |
37.9 |
27.7 |
50.7 |
|
1855 |
. 24.2 |
18.8 |
31.3 |
55.4 |
63.9 68.0 73.3 |
69.3 |
64.6 |
48.4 |
39.6 |
21.6 |
48.2 |
|
1856... |
. 10.6 |
17.3 |
28.5 |
51.1 |
61.4 76.5 . |
||||||
|
1857 |
78.5 |
71.1 |
65.7 |
49.3 |
29.3 |
31.3 |
|||||
|
1858 |
. 31.1 |
16.9 |
39.1 |
46.8 |
56.2 72.9 73.5 |
72.3 |
64.4 |
51.1 |
32.9 |
23.4 |
48.4 |
|
1859 |
. 22.8 |
25.9 |
40.3 |
43.7 |
63.0 66.2 75.0 |
73.3 |
60.7 |
48.6 |
39.2 |
17.4 |
48.0 |
|
1860 |
. 21.7 |
27.2 |
42.8 |
51.3 |
65.8 70.8 74.8 |
70.4 |
60.2 |
51.8 |
37.7 |
22.0 |
49.7 |
|
1861... |
. 16.2 |
24.7 |
33.3 |
51.0 |
56.9 71.0 72.5 |
71.4 |
61.4 |
50.4 |
35.7 |
28.0 |
47.7 |
|
1862 |
. 14.8 |
14.9 |
31.2 |
44.6 |
60.8 68.4 74.8 |
71.6 |
64.2 |
50.4 |
34.5 |
29.5 |
46.6 |
|
1863 |
28 6 |
24 8 |
33 0 |
51 4 |
62 3 67 6 71 2 |
71 7 |
62.6 |
43 0 |
34 6 |
24.8 |
48.0 |
|
1864 |
.14.8 |
24.8 |
32.7 |
46.1 |
63.3 72.1 76.0 |
72.1 |
63.1 |
47.1 |
33.9 |
17.0 |
'46.9 |
|
1865 |
. 18.1 |
28.6 |
31.7 |
47.2 |
61.7 70.8 68.5 |
71.5 |
70.2 |
50.1 |
40.8 |
20.6 |
48.3 |
|
1866... |
. 10.3 |
18.6 |
29.7 |
50.5 |
59.1 68.3 76.3 |
66.2 |
57.2 |
50.8 |
38.5 |
22.8 |
45.8 |
|
1867 |
. 15.4 |
25.4 |
25.9 |
47.5 |
51.9 72.3 73.9 |
74.1 |
64.3 |
51.5 |
40.1 |
23.2 |
47.1 |
|
1868 |
12 4 |
20 4 |
39 4 |
42 5 |
60 3 68 8 80 8 |
68.4 |
56 5 |
46 7 |
37.0 |
19.9 |
46.1 |
|
1869 |
. 23.6 |
25.6 |
28.8 |
45.4 |
58.8 68.2 71.3 |
71.6 |
62.1 |
41.6 |
31.5 |
25.2 |
46.2 |
|
1870 |
. 20.9 |
24.8 |
30.7 |
52.4 |
66.5 73.8 77.4 |
68.5 |
65.8 |
51.1 |
38.8 |
23.8 |
49.5 |
|
1871... |
. . 23.2 |
27.0 |
38.3 |
51.4 |
64.2 71.3 74.6 |
71.6 |
59.7 |
52.7 |
31.6 |
16.7 |
48.5 |
|
1872 |
|||||||||||
|
1873 |
|||||||||||
|
1874 |
22.6 |
33.6 |
42.0 |
68.4 72.1 77.7 |
74.2 |
64.2 |
52.2 |
33.8 |
25.3 |
||
|
1875 |
. 6.6 |
5.5 |
27.8 |
45.0 |
60.0 66.5 72.8 |
68.5 |
60.6 |
46.4 |
32.5 |
32.8 |
43.8 |
|
1876. . . |
. . 26.8 |
27.8 |
31.3 |
48.6 |
61.2 68.4 75.2 |
74.2 |
61.4 |
48.2 |
34.6 |
13.4 |
47.6 |
|
1877 |
. . 15.0 |
35.2 |
27.4 |
49.2 |
61.9 68.2 75.1 |
72.6 |
66.9 |
51.8 |
35.4 |
40.4 |
49.9 |
|
1878 |
,. 27.8 |
35.7 |
47.2 |
53.8 |
56.4 67.5 76.9 |
74.2 |
64.3 |
50.4 |
39.8 |
20.0 |
51.2 |
|
1879 |
. 17.0 |
22.2 |
37.3 |
50.2 |
62.9 69.0 76.2 |
71.7 |
60.0 |
59.7 |
37.4 |
21.0 |
48.7 |
|
1880 |
. 34.0 |
28.9 |
35.0 |
49.0 |
67.4 72.0 74.8 |
74.0 |
62.0 |
49.3 |
27.8 |
19.2 |
49.5 |
|
1881... |
. 12.2 |
20.0 |
31.1 |
44.9 |
68.8 69.4 76.3 |
75.6 |
67.4 |
53.4 |
36.2 |
34.2 |
49.1 |
|
1882 |
, . 23.3 |
35.5 |
37.0 |
48.4 |
53.9 66.5 68.2 |
71.1 |
61.8 |
54.1 |
37.3 |
22.2 |
48.3 |
|
1883 |
. 9.8 |
17.6 |
30.6 |
50.0 |
54.8 68.0 72.6 |
68.3 |
59.0 |
49.2 |
39.0 |
27.0 |
45.5 |
|
1884 |
, . 13.6 |
21.7 |
32.1 |
48.4 |
60.4 69.6 70.8 |
69.0 |
68.2 |
55.7 |
37.2 |
21.4 |
47.8 |
|
1885 |
. 11.3 |
12.6 |
30.6 |
47.4 |
57.6 67.6 74.5 |
67.2 |
62.3 |
47.8 |
38.2 |
24.8 |
45.1 |
|
1886... |
. 12.4 |
22.0 |
31.6 |
51.8 |
61.8 68.6 75.6 |
74.7 |
64.2 |
55.5 |
33.8 |
15.7 |
47.3 |
|
1887 |
. 10.6 |
20.5 |
32.6 |
50.5 |
66.2 72.3 77.9 |
71.0 |
62.6 |
46.8 |
35.4 |
22.8 |
47.4 |
|
1888 |
. . 7.1 |
18.4 |
26.3 |
48.0 |
54.0 69.1 75.4 |
70.6 |
59.6 |
48.5 |
39.0 |
29.9 |
45.5 |
|
1889 |
. . 23.6 |
17.4 |
41.0 |
50.0 |
59.4 66.2 73.0 |
71.6 |
62.6 |
47.6 |
34.8 |
37.4 |
48.7 |
|
1890 |
22.2 |
28.6 |
27.9 |
51.2 |
56.4 73.6 75.4 |
68.8 |
59.8 |
50.6 |
39.8 |
27.2 |
48.5 |
a Data since July, 1942, are from the Chicago Municipal Airport.
152 BULLETIN NO. 532
Table 4. — Average Monthly and Annual Temperatures (Continued)
[April,
|
Year |
Jan. |
Feb. |
Mar. |
Apr. |
May |
June July |
Aug. |
Sept. |
Oct. |
Nov. Dec. |
Annual |
|
DUBUQUE, Dubuque county, |
Iowa, |
concluded |
|||||||||
|
1891 |
. . 26.8 |
23.1 |
27.7 |
50.8 |
58.2 |
69.8 68.8 |
70.2 |
69.3 |
51.0 |
31.0 33.0 |
48.3 |
|
1892 |
. . 14.6 |
28.6 |
31.4 |
45.7 |
55.2 |
68.4 74.2 |
72.6 |
64.2 |
54.6 |
31 4 17 9 |
46 6 |
|
1893 |
.. 6.6 |
15.0 |
32.0 |
45.2 |
56.8 |
71.8 76.3 |
70.8 |
64.0 |
53.2 |
34.5 22.2 |
45.7 |
|
1894 |
. . 21.8 |
20.0 |
41.4 |
51.8 |
61.5 |
73.4 77.0 |
74.2 |
66.2 |
52.2 |
33.2 32.3 |
50.4 |
|
1895 |
. . 13.0 |
15.6 |
35.5 |
53.9 |
62.1 |
72.7 74.4 |
74.4 |
69.8 |
47.8 |
35.9 28.0 |
48.6 |
|
1896... |
. . 24.3 |
27.1 |
31.6 |
55.0 |
68.0 |
70.9 73.4 |
72.6 |
59.6 |
49.0 |
33.0 30.4 |
49.6 |
|
1897 |
. . 17.8 |
24.8 |
32.5 |
47.6 |
58.7 |
68.2 76.0 |
68.6 |
69 9 |
57 4 |
35 0 19 8 |
48 0 |
|
1898 |
. . 24.1 |
24.1 |
37.6 |
47.6 |
59.8 |
71.1 74.1 |
71.2 |
65.8 |
48.8 |
33.8 19.2 |
48.1 |
|
1899 |
. . 20.3 |
13.8 |
25.8 |
50.6 |
60.8 |
70.6 74.0 |
74.4 |
62.4 |
56.8 |
44 . 0 23 . 5 |
48.1 |
|
1900 |
. . 25.6 |
15.4 |
28.4 |
51.6 |
63.2 |
69.7 72.8 |
78.0 |
65.4 |
60.2 |
35.0 27.4 |
49.4 |
|
1901... |
. . 23.6 |
14.5 |
32.8 |
50.1 |
60.2 |
72.5 82.2 |
73.6 |
62.8 |
54.4 |
35.3 21.8 |
48.6 |
|
1902 |
. . 22.8 |
17.6 |
39.3 |
48.5 |
63.4 |
65.0 73.4 |
68.5 |
59.6 |
53.5 |
44.0 19.0 |
48.1 |
|
1903 |
. . 22.4 |
22.4 |
39.6 |
49.6 |
62.8 |
64.6 72.4 |
68.4 |
61.8 |
52.4 |
34.4 18.4 |
47.4 |
|
1904 |
. . 13.4 |
14.4 |
33.8 |
44.3 |
60.2 |
67.5 71.2 |
68.8 |
64.2 |
52.8 |
41.1 23.4 |
46.3 |
|
1905 |
. 12.0 |
13.4 |
39.0 |
48.2 |
58.9 |
70.1 71.4 |
73.5 |
67.0 |
50.9 |
38.4 27.6 |
47.5 |
|
1906... |
, . 25.2 |
22.4 |
27.2 |
52.2 |
60.4 |
68.0 72.2 |
74.2 |
68.6 |
50.8 |
36.6 26.8 |
48.7 |
|
1907 |
. . 19.8 |
23.9 |
40.9 |
41.6 |
52.7 |
66.4 73.6 |
70.1 |
61.7 |
49.5 |
37.1 29.2 |
47.2 |
|
1908 |
. . 24.8 |
24.0 |
37.8 |
48.8 |
59.7 |
67.4 73.4 |
69.6 |
68.1 |
51.7 |
38.8 25.8 |
49.2 |
|
1909 |
. 21.4 |
26.9 |
32.8 |
43.4 |
58.2 |
68.7 71.8 |
75.0 |
62.2 |
48.4 |
44.2 16.6 |
47.5 |
|
1910 |
. 18.4 |
18.0 |
47.8 |
51.4 |
56.2 |
70.0 76.0 |
72.8 |
62.8 |
55.0 |
32.4 23.2 |
48.7 |
|
1911... |
. . 21.2 |
28.0 |
38.9 |
46.4 |
65.9 |
73.8 74.8 |
70.1 |
64.0 |
48.9 |
30.7 31.0 |
49.5 |
|
1912 |
.. 3.8 |
17.1 |
25.2 |
49.8 |
61.8 |
66.8 73.2 |
69.7 |
63.8 |
52.5 |
40.6 30.2 |
46.2 |
|
1913 |
. 22.7 |
20.4 |
32.8 |
51.0 |
59.2 |
71.4 75.0 |
74.2 |
63.6 |
49.8 |
44.2 34.2 |
49.9 |
|
1914 |
. 28.2 |
15.8 |
34.6 |
48.5 |
62.6 |
69.8 76.4 |
72.8 |
64.4 |
56.7 |
40.6 18.4 |
49.1 |
|
1915 |
. 17.2 |
30.2 |
32.0 |
57.7 |
54.8 |
64.7 69.6 |
65.6 |
64.4 |
54.0 |
41.2 25.5 |
48.1 |
|
1916... |
.. 21.6 |
20.1 |
33.6 |
48.2 |
60.0 |
64.0 80.3 |
75.0 |
62.2 |
51.6 |
37.6 19.3 |
47.8 |
|
1917 |
. 16.6 |
14.2 |
34.8 |
46.4 |
54.8 |
65.2 73.8 |
68.6 |
61.8 |
41.9 |
40.2 15.8 |
44.5 |
|
1918 |
. 8.2 |
23.0 |
41.6 |
44.2 |
64.9 |
68.7 72.3 |
74.6 |
57.4 |
54.0 |
41.2 33.0 |
48.6 |
|
1919 |
. 25.9 |
25.7 |
36.6 |
49.0 |
57.8 |
72.8 76.6 |
70.8 |
66.1 |
52.0 |
34.6 14.4 |
48.5 |
|
1920 |
. 13.4 |
21.1 |
37.2 |
42.8 |
58.8 |
70.9 71.2 |
69.6 |
66.4 |
58.6 |
35.6 27.3 |
47.7 |
|
1921... |
. 28.5 |
29.8 |
41.2 |
52.2 |
63.6 |
75.0 79.0 |
71.6 |
66.9 |
52.9 |
34.2 27.2 |
51.8 |
|
1922 |
. 19.7 |
23.8 |
37.4 |
48.8 |
64.8 |
71.2 71.0 |
72.5 |
65.9 |
55.4 |
42.7 23.8 |
49.8 |
|
1923 |
.25.8 |
18.3 |
27.6 |
47.0 |
60.0 |
72.7 76.8 |
69.6 |
62.8 |
48.4 |
40.0 34.4 |
48.6 |
|
1924 |
. 13.6 |
25.7 |
32.0 |
49.4 |
53.8 |
66.0 70.0 |
70.0 |
58.2 |
57.5 |
38.4 16.4 |
45.9 |
|
1925 |
. 21.6 |
27.7 |
38.4 |
54.8 |
56.0 |
70.2 72.5 |
72.2 |
67.8 |
40.9 |
35.7 20.0 |
48.2 |
|
1926... |
. 22.2 |
29.3 |
29.2 |
44.4 |
62.5 |
64.4 73.2 |
72.8 |
62.8 |
49.9 |
32.9 22.0 |
47.1 |
|
1927 |
. 19.7 |
31.4 |
40.1 |
48.4 |
56.8 |
66.0 72.4 |
67.2 |
66.8 |
55.0 |
39.5 20.3 |
48.6 |
|
1928 |
. 23.8 |
28.2 |
37.4 |
44.2 |
62.4 |
64.5 73.6 |
71.8 |
59.8 |
53.8 |
39.2 29.1 |
49.0 |
|
1929 |
. 9.6 |
14.0 |
38.6 |
51.0 |
56.8 |
66.4 74.0 |
70.4 |
62.6 |
50.7 |
32.3 25.6 |
46.0 |
|
1930... |
. 11.8 |
33.7 |
35.6 |
50.6 |
60.3 |
69.0 76.0 |
74.2 |
65.6 |
50.1 |
40.6 25.4 |
49.4 |
|
1931... |
. 28.6 |
34.3 |
34.4 |
51.0 |
56.8 |
75.1 78.1 |
73.1 |
70.0 |
56.8 |
45.8 35.2 |
53.3 |
|
1932 |
. 26.5 |
30.7 |
27.2 |
48.2 |
62.1 |
72.1 76.0 |
72.3 |
61.9 |
48.8 |
33.6 23.5 |
48.6 |
|
1933 |
. 33.0 |
21.4 |
35.0 |
47.8 |
60.7 |
77.4 75.6 |
70.5 |
68.4 |
49.8 |
36.4 26.0 |
50.2 |
|
1934 |
. 28.4 |
21.6 |
32.8 |
49.6 |
69.0 |
77.3 77.5 |
71.0 |
61.9 |
56.0 |
43.3 21.1 |
50.8 |
|
1935 |
. 19.4 |
27.2 |
39.4 |
47.0 |
55.4 |
65.6 79.2 |
73.1 |
65.2 |
52.0 |
34.7 21.8 |
48.3 |
|
1936... |
. 11.9 |
7.8 |
38.2 |
45.2 |
66.4 |
68.6 81.1 |
76.8 |
66.3 |
50.0 |
34.8 29.2 |
48.0 |
|
1937 |
. 16.6 |
21.0 |
31.8 |
47.2 |
61.2 |
68.8 75.9 |
77.1 |
64.8 |
49.8 |
34.2 22.8 |
47.6 |
|
1938 |
. 20.0 |
31.6 |
42.8 |
50.8 |
59.8 |
69.0 75.9 |
75.0 |
65.2 |
57.8 |
38.8 26.0 |
51.1 |
|
1939 |
. 28.4 |
22.4 |
36.0 |
46.5 |
66.0 |
71.8 76.2 |
71.9 |
68.4 |
53.4 |
40.4 33.2 |
51.2 |
|
1940 |
. 11.8 |
25.4 |
30.6 |
47.0 |
57.8 |
71.4 76.8 |
71.0 |
64.9 |
56.4 |
34.8 29.2 |
48.1 |
|
1941... |
. 24.8 |
22.4 |
31.8 |
54.7 |
65.6 |
71.0 75.8 |
74.7 |
66.8 |
55.0 |
41.8 32.4 |
51.4 |
|
1942 |
. 21.8 |
24.2 |
39.4 |
55.0 |
59.4 |
69.4 74.5 |
72.0 |
61.3 |
52.8 |
38.9 20.6 |
49.1 |
|
1943 |
. 16.8 |
24.8 |
30.6 |
47.8 |
57.6 |
72.1 76.6 |
74.0 |
60.2 |
51.8 |
34.3 27.0 |
47.8 |
|
1944 |
. 29.7 |
26.8 |
30.8 |
45.2 |
64.6 |
71.8 72.9 |
72.9 |
65.3 |
53.1 |
40.6 20.6 |
49.5 |
|
1945 |
. 17.2 |
25.0 |
47.0 |
49.6 |
54.6 |
64.8 72.0 |
72.6 |
62.8 |
51.1 |
37.0 19.2 |
47.7 |
|
1946 |
. 23.4 |
26.6 |
46.0 |
54.0 |
57.5 |
69.4 74.4 |
70.0 |
63.6 |
57.0 |
39.7 30.4 |
51.0 |
|
Aver |
. 19.6 |
23.1 |
34.6 |
48.8 |
60.4 |
69.6 74.6 |
71.7 |
63.8 |
51.6 |
36.8 24.7 |
48.3 |
1949] CLIMATE OF ILLINOIS: APPENDIX A 153
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. |
May |
June July |
Aug. |
Sept. Oct. |
Nov. |
Dec. |
Annual |
|
PEORIA |
, Peoria county |
||||||||||
|
1856 |
. 15.4 |
22.0 |
33.4 |
55.1 |
59.4 |
73.4 75.1 |
68.2 |
62.5 55.2 |
36.5 |
22.2 |
48.2 |
|
1857 |
. 12.2 |
34.9 |
31.2 |
38.5 |
56.3 |
67.5 74.4 |
71.2 |
66.4 50.4 |
34.2 |
34.1 |
47.5 |
|
1858 |
. 34.4 |
20.4 |
40.5 |
49.4 |
56.5 |
72.3 74.5 |
72.8 |
64.5 51.1 |
35.1 |
31.3 |
50.2 |
|
1859 |
.27.2 |
32.1 |
43.8 |
46.4 |
64.5 |
68.3 75.2 |
71.5 |
62.9 49.3 |
42.4 |
19.4 |
50.2 |
|
1860 |
. 25 2 |
31 6 |
43 6 |
52 3 |
66 4 |
72 4 74.1 |
72 5 |
63 7 53 3 |
36 4 |
23 6 |
51 3 |
|
1861... |
. 23.2 |
33.7 |
38 .'6 |
51.7 |
57.4 |
72.3 72.2 |
74.1 |
63.5 53.4 |
39.2 |
33.4 |
51.1 |
|
1862 . |
. 21.1 |
23 2 |
36 2 |
47.2 |
62.6 |
68.7 75 4 |
74 6 |
67 3 53 2 |
36 0 |
34 3 |
50 0 |
|
1863 |
. 32.5 |
31.2 |
36.4 |
51.2 |
62.8 |
66.6 72.1 |
72.4 |
62.3 45.1 |
40.2 |
31.1 |
50.2 |
|
1864 |
. 23.2 |
33.4 |
37.3 |
46.5 |
63.3 |
71.1 74.4 |
72.3 |
64.4 48.0 |
39.2 |
25.4 |
49.1 |
|
1865 |
. 23.4 |
35.2 |
39.1 |
48.6 |
61.1 |
72.0 68.2 |
70.4 |
70.2 53.4 |
41.0 |
25.0 |
50.5 |
|
1866... |
. 24.2 |
25.3 |
33.2 |
53.7 |
58.0 |
67.6 75.1 |
67.4 |
57.9 52.6 |
41.1 |
27.0 |
48.9 |
|
1867 |
. 19.0 |
31.9 |
28.5 |
48.9 |
53.0 |
72 . 1 73 . 4 |
73 1 |
66 . 8 53 . 6 |
43.0 |
28.1 |
49.3 |
|
1868 |
. 18.0 |
26.9 |
44.3 |
45.0 |
59.6 |
69.2 80.0 |
68.0 |
59.0 50.2 |
40.0 |
24.4 |
48.9 |
|
1869 |
. 33.1 |
31.4 |
31.4 |
46.8 |
59.0 |
66.0 70.0 |
74.0 |
64.0 44.0 |
34.6 |
29.4 |
48.6 |
|
1870 |
. 27.2 |
30'. 3 |
34.4 |
53.0 |
65.6 |
72.1 78.0 |
71.5 |
68.0 54.0 |
42.1 |
26.2 |
51.8 |
|
1871... |
. 28.5 |
32.0 |
44.6 |
54.8 |
64.6 |
72.0 73.5 |
73.0 |
63.3 56.0 |
35.1 |
23.2 |
51.7 |
|
1872 |
. 25.3 |
28.2 |
33.4 |
52.0 |
62.4 |
73.2 76.3 |
76.0 |
64.3 51.1 |
32.0 |
19.4 |
49.6 |
|
1873 |
. 17.9 |
24.8 |
37.4 |
47.6 |
61.2 |
77.0 75.1 |
76.5 |
62.6 48.0 |
34.6 |
31.0 |
49.6 |
|
1874 |
.27.2 |
30.0 |
37.6 |
42.7 |
65.0 |
75.2 78.3 |
76.0 |
67.4 53.8 |
37.6 |
29.6 |
51.5 |
|
1875 |
. 13.2 |
14.0 |
31.6 |
46.5 |
61.0 |
70.1 74.0 |
72.2 |
63.0 48.4 |
35.0 |
37 1 |
46.9 |
|
1876... |
. 32.5 |
33.2 |
34.2 |
52.6 |
64.8 |
69.0 76.6 |
74.0 |
63.6 49.8 |
37.2 |
17.8 |
50.3 |
|
1877 |
. 20.0 |
37.3 |
32.3 |
52.0 |
62.8 |
69 . 7 76 . 6 |
74.0 |
68.4 56.0 |
38.6 |
44.3 |
52.6 |
|
1878 |
. 31.5 |
37.3 |
49.8 |
56.0 |
60.0 |
69.4 80.0 |
76.6 |
67.2 51.8 |
41.8 |
21.4 |
53.4 |
|
1879 |
.19.6 |
22.8 |
41.5 |
52.1 |
66.2 |
71.0 79.0 |
76.0 |
62.4 61.1 |
42.0 |
29.0 |
51.4 |
|
1880 |
. 40.2 |
35.0 |
39.1 |
53.0 |
68.3 |
74.3 76.6 |
76.7 |
63.4 49.8 |
30.2 |
22.4 |
52.5 |
|
1881... |
. 17.1 |
23.7 |
32.2 |
45.8 |
69.6 |
71.0 78.1 |
78.4 |
71.2 56.6 |
39.9 |
37.3 |
52.0 |
|
1882 |
. 28.4 |
40.3 |
42.0 |
52.5 |
57.2 |
71.0 72.0 |
73.6 |
64.2 57.0 |
42.3 |
?7 1 |
52.4 |
|
1883 |
. 15.0 |
23.7 |
35.1 |
53.1 |
58.3 |
70.3 75.1 |
71.0 |
62.3 51.0 |
42.5 |
31.4 |
49.1 |
|
1884 |
. 17.7 |
29.2 |
37.6 |
51.2 |
62.4 |
72.0 74.2 |
73.0 |
71.4 57.5 |
41.8 |
26.8 |
51.2 |
|
1885 |
. 16.8 |
15.9 |
34.2 |
51.2 |
62.0 |
71.0 79.2 |
72.1 |
65.4 50.6 |
42.0 |
30.8 |
48.8 |
|
1886... |
. 16.9 |
26.4 |
37.2 |
54.7 |
64.7 |
71.1 77.1 |
75.7 |
66.8 55.4 |
36.6 |
21.0 |
50.3 |
|
1887 |
. 17.9 |
29.7 |
35.9 |
54.4 |
68.1 |
74.7 80.1 |
73.6 |
65.6 47.9 |
38.1 |
26.9 |
51.1 |
|
1888 |
. 15;5 |
25.4 |
34.1 |
52.4 |
58.5 |
71.4 76.6 |
69.8 |
58.9 48.3 |
38.9 |
31.3 |
48.4 |
|
1889 |
. 27.5 |
22.6 |
40.1 |
51.9 |
59.6 |
70.3 73.5 |
70.3 |
61.9 47.0 |
36.3 |
40.5 |
50.1 |
|
1890 |
. 29.8 |
32.7 |
32.0 |
52.8 |
58.4 |
75.9 76.1 |
70.2 |
61.1 51.7 |
41.1 |
30.8 |
51.0 |
|
1891... |
. 29.2 |
28.7 |
31.3 |
53.1 |
58.9 |
70.6 69.6 |
69.1 |
67.5 51.4 |
34.7 |
35.5 |
50.0 |
|
1892 |
. 18.4 |
32.0 |
34.4 |
48.0 |
57.4 |
71.2 73.8 |
72.8 |
62.9 55.5 |
34.5 |
25.5 |
48.9 |
|
1893 |
. 13.3 |
23.0 |
36.4 |
48.8 |
58.2 |
72.7 77.9 |
71.0 |
66.0 53.0 |
36.2 |
27.4 |
48.7 |
|
1894 |
. 27.5 |
24.2 |
44.0 |
56.4 |
60.9 |
74.2 75.4 |
72.0 |
65.0 52.3 |
34.7 |
31.5 |
51.5 |
|
1895 |
. 17.8 |
17.2 |
35.8 |
52.9 |
63.4 |
74.5 72.7 |
73.2 |
67.1 45.1 |
37.0 |
30.3 |
48.9 |
|
1896... |
. 28.1 |
27.4 |
34.8 |
58.1 |
68.5 |
70.9 74.5 |
72.8 |
60.7 49.0 |
38.0 |
33.8 |
51.4 |
|
1897 |
. 22.2 |
29.3 |
37.0 |
49.2 |
58.9 |
70.9 76.1 |
69.4 |
69.0 57.9 |
38.6 |
24.5 |
50.2 |
|
1898 |
. 28.5 |
29.1 |
41.0 |
49.1 |
60.5 |
73.3 76.0 |
72.6 |
68.0 50.2 |
36.2 |
25.2 |
50.8 |
|
1899 |
. 24.4 |
18.1 |
31.1 |
53.0 |
63.3 |
72 . 7 74 . 1 |
74.9 |
62.6 57.2 |
44.7 |
26.8 |
50.2 |
|
1900 |
. 28.6 |
21.7 |
31.7 |
51.8 |
63.6 |
70.7 74.7 |
78.1 |
66.2 59.4 |
38.2 |
29.3 |
51.2 |
|
1901 |
. 26.8 |
26.6 |
36.0 |
49.9 |
61.1 |
74.1 81.1 |
73.7 |
64.6 54.3 |
36.8 |
24.6 |
50.8 |
|
1902 |
. 26.1 |
21.1 |
41.4 |
50.0 |
66.6 |
67.8 74.4 |
70.3 |
61.5 55.1 |
47.6 |
27.4 |
50.8 |
|
1903 |
. 26.1 |
26.7 |
44.1 |
50.0 |
65.2 |
67.1 75.9 |
71.4 |
64.5 52.7 |
35.9 |
21.2 |
50.1 |
|
1904 |
. 18.2 |
20.0 |
36.4 |
45.4 |
62.9 |
70.4 72.9 |
69.1 |
65.4 51.8 |
41.3 |
28.0 |
48.5 |
|
1905 |
. 18.8 |
15.2 |
43.9 |
50.5 |
61.6 |
71.2 72.0 |
74.4 |
67.6 52.3 |
40.0 |
29.8 |
50.0 |
|
1906... |
. 30.2 |
27.0 |
29.3 |
54.2 |
63.0 |
69.3 72.6 |
75.4 |
69.7 52.8 |
39.5 |
30.6 |
51.1 |
|
1907 |
. 28.0 |
28.3 |
45.6 |
43.4 |
55.1 |
66.9 74.2 |
71.9 |
64.4 51.4 |
38.3 |
32.6 |
50.0 |
|
1908 |
. 26.8 |
27.0 |
42.3 |
51.0 |
62.0 |
69.4 74.2 |
72.6 |
69.0 54.1 |
41.8 |
29.4 |
51.6 |
|
1909 |
. 26.3 |
31.8 |
36.8 |
48.4 |
59.2 |
71.2 71.4 |
77.0 |
64.0 49.8 |
48.0 |
19.2 |
50.3 |
|
1910 |
. 24.3 |
23.8 |
49.8 |
52.0 |
56.4 |
69.8 75.4 |
72.2 |
65.4 56.6 |
35.2 |
25.4 |
50.5 |
|
1911... |
. 27.4 |
32.2 |
40.2 |
48.4 |
68.2 |
75.5 75.0 |
72.0 |
67.8 51.4 |
33.3 |
33.0 |
52.0 |
|
1912 |
. 11.0 |
20.8 |
28.4 |
51.5 |
64.2 |
68.4 74.8 |
72.4 |
67.0 54.8 |
41.8 |
32.7 |
49.0 |
|
1913 |
. 27.8 |
24.4 |
35.4 |
51.7 |
62.4 |
73.2 78.5 |
77.8 |
66.8 52.0 |
47.2 |
35.7 |
52.7 |
|
1914 |
. 32.2 |
19.3 |
36.8 |
51.2 |
65.0 |
74.2 78.8 |
75.4 |
66.2 57.2 |
43.4 |
20.8 |
51.7 |
|
1915 |
. 21.0 |
35.4 |
34.1 |
58.8 |
58.6 |
67.8 71.9 |
67.2 |
67.8 55.6 |
43.8 |
27.8 |
50.8 |
154 BULLETIN NO. 532 [April,
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. |
May June July |
Aug. |
Sept. |
Oct. |
Nov. |
Dec. |
Annual |
|
PEORIA, |
Peoria county, |
concluded |
|||||||||
|
1916... |
. . 27.2 |
24.4 |
37.4 |
49.8 |
61.4 65.8 81.0 |
76.0 |
63.6 |
54.2 |
42.4 |
25.2 |
50.7 |
|
1917 |
24 4 |
20 8 |
40.0 |
47.4 |
55.6 67.7 75 0 |
70 8 |
63.7 |
44 2 |
41 8 |
19 8 |
47 6 |
|
1918 |
. 10.4 |
27.9 |
45.6 |
45.8 |
66.4 71.4 72.8 |
77.5 |
58.2 |
56.2 |
41.9 |
36.6 |
50.9 |
|
1919 |
29 2 |
30 8 |
40 8 |
51 3 |
58 2 74 8 78 4 |
71 9 |
68 2 |
55 8 |
37 9 |
20 6 |
51 5 |
|
1920 |
. 18.6 |
27.6 |
41.5 |
44.2 |
60.8 72.0 73.6 |
72.2 |
68.5 |
60.2 |
38.6 |
30.8 |
50.7 |
|
1921 |
32 2 |
34 4 |
47 3 |
54 3 |
65 1 76 8 79 8 |
73 8 |
70 0 |
55 6 |
39 9 |
32 2 |
|
|
1922 |
23 8 |
29 9 |
41.2 |
52.5 |
65 . 6 73 . 2 74 . 7 |
74 5 |
69 6 |
58.0 |
43.2 |
28 8 |
52 9 |
|
1923 |
. 31.8 |
23.2 |
34.2 |
49.4 |
61.0 73.0 77.6 |
73.4 |
65.4 |
50.4 |
42.2 |
38 0 |
51 6 |
|
1924 |
. 19.0 |
28.0 |
34.8 |
53.5 |
55.5 69.2 71.0 |
72.7 |
60.4 |
59.2 |
41.2 |
21.8 |
48.9 |
|
1925 |
. 23 5 |
33 1 |
41.1 |
57.8 |
57 . 8 73 . 4 74 . 9 |
73.9 |
71.6 |
43.4 |
37.7 |
24 8 |
51 1 |
|
1926 |
. 26.9 |
33.4 |
32.0 |
44.0 |
64.0 67.2 75.8 |
74.4 |
65.6 |
52.5 |
36.2 |
26.8 |
49.9 |
|
1927 |
. 23.4 |
36.1 |
43.2 |
50.8 |
60.0 67.2 73.7 |
68.5 |
70.0 |
58.0 |
43.3 |
25.9 |
51.7 |
|
1928 |
. 26.5 |
32.3 |
40.4 |
47.6 |
63 . 3 66 . 0 75 . 6 |
74.8 |
61.2 |
57.0 |
41.7 |
32.0 |
51.5 |
|
1929 |
17 8 |
21 2 |
45 4 |
53 6 |
59 4 68 6 75 3 |
71 6 |
75 2 |
53 0 |
35 8 |
28 2 |
49 6 |
|
1930 |
17 0 |
38.4 |
38.8 |
55 0 |
63.3 71 6 78 2 |
76 1 |
69 8 |
53 0 |
42 4 |
29 8 |
52 8 |
|
1931... |
. 32.6 |
36.7 |
36.7 |
52.6 |
58.2 75.7 79.2 |
74.0 |
73.0 |
59.2 |
50.2 |
38.6 |
55.6 |
|
1932 |
33 2 |
36 8 |
31 8 |
51 4 |
63 7 73 4 76 7 |
74 2 |
64 8 |
52 8 |
36 0 |
27 8 |
51 9 |
|
1933 |
. 37.6 |
26.8 |
39.4 |
50.9 |
62.8 78.9 78.5 |
73.0 |
72.6 |
51.8 |
39.6 |
32.6 |
53 7 |
|
1934 |
. 31.6 |
23.8 |
34.1 |
51.6 |
68.7 79.2 81.0 |
74.4 |
63.8 |
57.4 |
46.0 |
26.0 |
53.1 |
|
1935 |
26 2 |
31 4 |
44 3 |
48 4 |
55 8 67 4 79 2 |
74.8 |
65 8 |
54 4 |
38 6 |
23 2 |
50 8 |
|
1936 |
. 17.2 |
14.8 |
41.9 |
48.2 |
67.0 72.0 84.3 |
80.3 |
70.5 |
54.2 |
37.8 |
33.8 |
51.8 |
|
1937 |
23 8 |
27 8 |
36 2 |
49 7 |
63 2 70 8 75 8 |
78 3 |
65 8 |
52 2 |
36 7 |
26 7 |
50 6 |
|
1938 |
26 2 |
36 2 |
47 4 |
53 3 |
62 2 69.9 76.6 |
77 2 |
68.1 |
60.3 |
43.0 |
30 0 |
54 2 |
|
1939 |
. 32.2 |
27.6 |
41.0 |
47.7 |
66 . 2 73 . 0 76 . 2 |
73.2 |
71.7 |
57.1 |
41.2 |
33.9 |
53.4 |
|
1940 |
13 3 |
29 4 |
35 9 |
49 8 |
58 9 73 4 77 4 |
74 8 |
66 6 |
59 0 |
38 2 |
34 0 |
50 9 |
|
1941 |
. 28.4 |
25.7 |
35.4 |
56.0 |
66.8 73.4 77.0 |
76.2 |
69.7 |
58.1 |
43.2 |
36.7 |
53.9 |
|
1942 |
. 25.6 |
26.8 |
42.0 |
56.1 |
61.9 71.9 76.3 |
73.4 |
64.8 |
55.2 |
41.4 |
24.6 |
51.7 |
|
1943 |
24 3 |
30 6 |
35 4 |
48 8 |
58 8» 73 2 76 1 |
75 6 |
61 9 |
53 8 |
36 4 |
26 2 |
50 1 |
|
1944 |
. 31 0 |
29.4 |
34.4 |
47.4 |
66 . 4 74 . 2 74 . 8 |
73.8 |
66.2 |
54.4 |
43.0 |
22.2 |
51.4 |
|
1945 |
. 19.8 |
29.6 |
49.4 |
51.6 |
55.6 66.4 72.4 |
74.0 |
65.4 |
51.5 |
39.6 |
21.6 |
49.7 |
|
1946 |
. 27 2 |
30 8 |
50 1 |
54 2 |
58.2 70.4 76 1 |
69.9 |
65.8 |
59.0 |
42.8 |
33.0 |
53.1 |
|
. 24.3 |
28.0 |
38.1 |
50.8 |
61.7 71.3 75.7 |
73.4 |
65.8 |
53.3 |
39.5 |
28.4 |
50.9 |
|
|
SPRINGFIELD, Sangamon county |
|||||||||||
|
1879... |
. 80.5 |
73.6 |
62.5 |
62.4 |
44.8 |
32.2 |
|||||
|
1880 |
. 44 2 |
38 1 |
42.1 |
56 0 |
68 4 73 8 76 8 |
77 0 |
64 6 |
53 8 |
32.3 |
27 0 |
54 2 |
|
1881 . . . |
. 22.0 |
29.7 |
36.4 |
48.6 |
69.4 72.0 79.0 |
79.1 |
73.0 |
59.4 |
42.2 |
40.4 |
'54.3 |
|
1882 |
31 8 |
43 2 |
45 0 |
55 6 |
57 9 71 4 72 5 |
73 6 |
66 0 |
59.5 |
44 8 |
31 0 |
54.4' |
|
1883 |
. 21.2 |
29 6 |
38 8 |
54.6 |
60 . 4 69 . 4 75 . 1 |
70.6 |
63.4 |
53.1 |
44.6 |
35.3 |
51.3 |
|
1884 |
. 21.2 |
32.8 |
40.2 |
51.9 |
61.8 71.4 74.9 |
72.6 |
71.8 |
60.4 |
44.9 |
29.6 |
52.8 |
|
1885 |
. 20.3 |
21.4 |
37.4 |
51.7 |
61.6 71.1 78.3 |
71.2 |
65.0 |
53.6 |
46.8 |
36.5 |
51.3 |
|
1886 |
. 23.6 |
32.1 |
41.9 |
55.8 |
65.0 71.3 77.5 |
76.6 |
68.0 |
58.2 |
43.1 |
27.2 |
53.4 |
|
1887 |
. 23.8 |
35.4 |
40.6 |
54.7 |
67.4 73.0 79.9 |
74.4 |
66.2 |
50.6 |
41.5 |
28.0 |
53.0 |
|
1888 |
. 17.9 |
27.7 |
35.8 |
53.6 |
59.1 70.2 76.4 |
71.4 |
63.0 |
50.9 |
42.0 |
34.2 |
50.2 |
|
1889 |
. 30.7 |
25.4 |
43.3 |
54.1 |
60.8 67.7 74.7 |
72.3 |
64.4 |
51.0 |
38.2 |
44.4 |
52.2 |
|
1890 |
. 33.3 |
35.8 |
34.2 |
54.0 |
60.0 76.0 75.9 |
71.0 |
62.7 |
54.4 |
45.2 |
34.0 |
53.0 |
|
1891 |
. 32.4 |
31.4 |
33.8 |
54.9 |
60.6 73.2 71.0 |
71.5 |
70.8 |
54.4 |
37.1 |
38.2 |
52.4 |
|
1892 |
. 20.8 |
34.8 |
36.8 |
49.8 |
59.0 73.0 74.2 |
74.4 |
66.4 |
56.9 |
37.2 |
28.4 |
51.0 |
|
1893 |
. 16.8 |
25.2 |
39.0 |
51.3 |
59.9 72.8 78.0 |
72.9 |
69.2 |
55.8 |
40.0 |
30.3 |
50.9 |
|
1894 |
. 29.4 |
26.2 |
46.6 |
54.0 |
62.4 75.2 76.5 |
74.8 |
67.5 |
55.8 |
37.8 |
35.2 |
53.4 |
|
1895 |
.21.5 |
19.6 |
39.4 |
54.9 |
63.8 74.6 73.4 |
75.3 |
70.6 |
49.5 |
39.6 |
33.6 |
51.3 |
|
1896 |
. 30.4 |
32.0 |
36.2 |
60.0 |
70.0 72.2 75.2 |
75.0 |
64.1 |
52.6 |
41.0 |
36.2 |
53.7 |
|
1897 |
. 25.2 |
31.8 |
41.0 |
50.6 |
59.9 71.8 77.5 |
72.4 |
73.2 |
62.4 |
41.2 |
28.0 |
52.9 |
|
1898 |
. 32.2 |
32.4 |
43.9 |
50.6 |
62.6 74.3 76.2 |
74.6 |
70.0 |
52.4 |
38.2 |
27.6 |
52.9 |
|
1899 |
.27.2 |
19.0 |
34.0 |
54.5 |
64.6 73.8 76.2 |
76.7 |
65.4 |
60.4 |
47.7 |
30.6 |
52.5 |
|
1900 |
33.5 |
25.3 |
36.6 |
54.7 |
65.0 71.9 76.0 |
80.2 |
69.6 |
62.9 |
42.2 |
32.4 |
54.2 |
Data since May, 1943, are from the Peoria Municipal Airport.
1949] CLIMATE OF ILLINOIS: APPENDIX A 155
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. May |
June July |
Aug. |
Sept. |
Oct. |
Nov. |
Dec. |
Annual |
|
SPRINGFIELD, Sangamon county, |
concluded |
||||||||||
|
1901 |
. 31.0 |
24.3 |
39.8 |
50.8 62.3 |
75.6 82.8 |
75.8 |
67.4 |
57.9 |
39.4 |
25.5 |
52.7 |
|
1902 |
. 27.8 |
20.6 |
42.8 |
50.7 67.9 |
69.4 76.7 |
72.1 |
62.5 |
58.0 |
49.0 |
28.6 |
52.2 |
|
1903 |
. 27.2 |
28.2 |
45.4 |
53 . 2 65 . 4 |
67 . 0 76 . 6 |
73.1 |
66.4 |
56 2 |
38 3 |
24 6 |
51 8 |
|
1904 |
. 21.0 |
23.9 |
39.8 |
46.8 62.1 |
69.5 73.4 |
71.2 |
67.2 |
55.6 |
44.2 |
30.2 |
50.4 |
|
1905 |
20.4 |
18.6 |
46 6 |
52 6 63 2 |
73 . 5 74 . 1 |
75.8 |
68 7 |
54 3 |
42 8 |
31 7 |
51 9 |
|
1906... |
. 33.1 |
29.1 |
30.6 |
56.4 64.8 |
71.2 75.4 |
77.0 |
71.9 |
54.8 |
41.4 |
33.0 |
53.2 |
|
1907 |
32 2 |
31 4 |
49 1 |
45 0 57.2 |
69 . 6 77 . 4 |
74 0 |
67 3 |
53 8 |
41 5 |
34 4 |
52 7 |
|
1908 |
. 29.8 |
29 7 |
45.5 |
53 . 1 64 . 6 |
71.8 76.4 |
75.2 |
70.2 |
55.2 |
44.6 |
33.7 |
54 2 |
|
1909 |
.29.1 |
34.7 |
40.2 |
51.6 61.6 |
73.0 73.6 |
78.4 |
65.2 |
51.9 |
50.4 |
22.0 |
52.6 |
|
1910 |
. 28.0 |
26 2 |
52.8 |
53.6 58.8 |
71.8 76 4 |
73.8 |
67 6 |
58 2 |
38 0 |
28 4 |
52 8 |
|
1911 |
. 30.9 |
35.5 |
42.6 |
51.4 70.1 |
77.9 77.2 |
73.6 |
70.0 |
54.4 |
36.0 |
34.8 |
54.5 |
|
1912 |
. 15.2 |
24.1 |
32.1 |
54.6 66.4 |
69.8 77.2 |
74.2 |
68.2 |
57.1 |
43.4 |
34.6 |
51.4 |
|
1913 |
. 30.6 |
26.8 |
37.9 |
53.6 65.0 |
76 . 2 80 . 0 |
79.9 |
67.8 |
53.6 |
49.2 |
37.8 |
54 9 |
|
1914 |
35 4 |
21 3 |
39 2 |
54 0 67 2 |
77 3 81 0 |
77 2 |
67 7 |
58 1 |
46 2 |
24 2 |
54 1 |
|
1915 |
24 7 |
37 8 |
35 8 |
60 0 60 5 |
69.6 74 0 |
68 4 |
69.2 |
57.7 |
46 0 |
30.4 |
52 8 |
|
1916 |
. 29.6 |
27.2 |
39.8 |
51.6 64.6 |
68.3 83.0 |
77.3 |
65.7 |
55.4 |
44.6 |
28.6 |
53.0 |
|
1917 |
. 29.0 |
24.6 |
42.6 |
50.0 58.3 |
69.7 76.7 |
72.4 |
65.2 |
47.4 |
43.8 |
22.6 |
50.2 |
|
1£18 |
. 13.6 |
30.8 |
48.9 |
47.8 68.6 |
73.8 75.0 |
80.1 |
60.4 |
58.4 |
43.2 |
39.2 |
53.8 |
|
1919 |
. 32.8 |
32.9 |
42.9 |
54.0 60.5 |
76.0 79.8 |
74.0 |
70.5 |
57.8 |
40.6 |
24.2 |
53.5 |
|
1920 |
23 0 |
30 4 |
43 0 |
46 7 62 2 |
72 8 76 2 |
72 9 |
69 5 |
60 6 |
40 0 |
32 6 |
52 3 |
|
1921... |
. 34.4 |
37.5 |
49.6 |
55.6 66.8 |
77.6 81.2 |
74.8 |
72.0 |
56.8 |
43.0 |
34.7 |
57.0 |
|
1922 |
. 25.2 |
32.4 |
43.2 |
54.6 67.0 |
75.4 76.4 |
76.6 |
70.9 |
59.2 |
45.2 |
32.0 |
54.8 |
|
1923 |
. 34 6 |
26.2 |
37.4 |
51 8 62.3 |
74.2 78 8 |
75.0 |
66.4 |
52.0 |
44.2 |
40.6 |
53 6 |
|
1924 |
. 21.8 |
31.0 |
36.8 |
55.9 57.4 |
71.1 73.2 |
75.4 |
62.2 |
61.0 |
43.2 |
25.6 |
51.2 |
|
1925 |
. 27.2 |
36.4 |
43.8 |
59.4 61.0 |
76.0 77.0 |
75.5 |
74.2 |
46.0 |
39.5 |
28.0 |
53.7 |
|
1926 |
. 29.8 |
35.6 |
35.0 |
46.4 66.0 |
69.2 77.8 |
76.7 |
67.8 |
55.3 |
37.4 |
29.6 |
52.2 |
|
1927 |
. 26.4 |
39.0 |
45.0 |
53.0 61.8 |
68.9 75.8 |
69.6 |
71.6 |
59.8 |
45.2 |
28.4 |
53.7 |
|
1928 |
29 6 |
34 1 |
42 2 |
49 3 64 0 |
67 4 77.8 |
76.3 |
64.0 |
58.6 |
43.0 |
34.6 |
53.4 |
|
1929 |
. 21.2 |
23.8 |
47.2 |
54.6 59.0 |
69.3 76.6 |
72.6 |
65.4 |
54.6 |
37.2 |
30.4 |
51.0 |
|
1930....... |
. 19.6 |
40.4 |
39.2 |
56.7 64.0 |
71.8 79.4 |
77.0 |
69.9 |
53.9 |
44.4 |
32.2 |
54.0 |
|
1931 |
. 34.4 |
38.6 |
37.8 |
54 . 9 60 . 6 |
77.4 81.2 |
75.6 |
74.8 |
60.7 |
52.0 |
41.0 |
57.4 |
|
1932 |
. 36.0 |
40.2 |
35.0 |
54.4 66.4 |
75.2 79.0 |
76.2 |
67.5 |
55.2 |
37.0 |
30.6 |
54.4 |
|
1933 |
. 39 6 |
30 8 |
41 9 |
53 4 65 2 |
80 7 80 4 |
75.2 |
75.4 |
54.7 |
42.1 |
36.0 |
56.3 |
|
1934 |
. 34.0 |
27.1 |
36.4 |
54.6 69.7 |
81.4 83.4 |
77.0 |
65.2 |
60.1 |
48.0 |
29.6 |
55.5 |
|
1935 |
. 29.8 |
34.6 |
48.0 |
50.2 58.8 |
69.9 81.4 |
77.4 |
68.8 |
56.8 |
40.8 |
26.2 |
53.6 |
|
1936... |
. 21.2 |
19.7 |
45.0 |
50.4 69.2 |
74.2 86.2 |
82.5 |
72.8 |
56.6 |
40.0 |
35.8 |
54.5 |
|
1937 |
. 27.3 |
30.4 |
39.0 |
52.6 65.4 |
73.4 78.0 |
79.5 |
67.6 |
54.4 |
38.8 |
29.2 |
53.0 |
|
1938 |
. 29.2 |
39.1 |
50.5 |
55.4 64.0 |
72.8 80.2 |
79.4 |
71.9 |
62.6 |
45.4 |
32.7 |
56.9 |
|
1939 |
. 35.4 |
30.6 |
44.2 |
50.7 68.0 |
75.3 79.0 |
75.3 |
74.3 |
59.6 |
43.4 |
36.2 |
56.0 |
|
1940 |
. 14.5 |
31.0 |
39.5 |
51.4 61.4 |
75.7 78.8 |
76.7 |
68.8 |
62.6 |
41.1 |
36.4 |
53.2 |
|
1941 . . . |
. 30.9 |
29.1 |
38.0 |
58.3 69.4 |
76.1 78.8 |
78.0 |
71.4 |
60.9 |
44.8 |
38.6 |
56.2 |
|
1942 |
. 29.0 |
29.9 |
44.4 |
58.4 64.5 |
73.9 78.8 |
75.5 |
67.6 |
57.4 |
45.3 |
28.0 |
54.4 |
|
1943 |
. 27.6 |
35.4 |
38.0 |
51.9 62.2 |
76.8 79.8 |
79.0 |
65.2 |
56.8 |
40.4 |
28.6 |
53.5 |
|
1944 |
. 33.6 |
33.8 |
38.1 |
50.8 69.8 |
78.3 79.0 |
77.0 |
69.2 |
58.4 |
45.2 |
25.6 |
54.9 |
|
1945 |
. 24.4 |
33.3 |
52.3 |
54.7 59.4 |
69.5 76.0 |
76.0 |
67.8 |
55.8 |
43.0 |
25.2 |
53.1 |
|
1946 |
. 31.2 |
35.4 |
54.6 |
57.4 61.2 |
74.6 78.2 |
72.2 |
68.6 |
62.0 |
46.1 |
36.9 |
56.5 |
|
Aver |
.27.6 |
30.5 |
41.2 |
53.1 63.5 |
72 . 8 77 . 5 |
75.1 |
68.0 |
56.4 |
42.5 |
31.7 |
53 3 |
|
URBANA, |
Champaign |
county |
|||||||||
|
1889... |
. 29.3 |
23.4 |
39.9 |
51.9 59.2 |
65.5 72.7 |
69.2 |
61.3 |
47.3 |
36.8 |
42.7 |
49.9 |
|
1890 |
. 33.5 |
34.7 |
33.4 |
52.3 58.3 |
74.6 73.0 |
68.7 |
60.5 |
52.1 |
42.6 |
30.9 |
51.2 |
|
1891... |
. 30.3 |
30.5 |
32.6 |
52.8 58.4 |
71.9 70.1 |
70.2 |
69.2 |
51.3 |
35.7 |
37.0 |
50.8 |
|
1892 |
. 19.2 |
33.0 |
36.1 |
48.6 57.9 |
70.6 73.3 |
71.5 |
63.9 |
53.6 |
34.8 |
27.7 |
49.1 |
|
1893 |
. 14.8 |
25.8 |
37.8 |
49.3 57.4 |
70.5 76.4 |
71.1 |
66.5 |
53.3 |
37.3 |
30.0 |
49.1 |
|
1894 |
. 29.4 |
24.7 |
43.5 |
51.4 59.6 |
73.4 73.8 |
72.3 |
65.0 |
51.9 |
35.9 |
32.9 |
51.1 |
|
1895 |
. 29.2 |
23.3 |
35.9 |
52.3 59.4 |
73.3 71.3 |
73.2 |
61.3 |
47.2 |
36.8 |
42.7 |
55.1 |
|
1896... |
. 28.1 |
29.6 |
34.4 |
57.6 68.2 |
70.2 73.8 |
72.0 |
61.9 |
48.8 |
39.9 |
33.3 |
51.4 |
|
1897 |
. 22.0 |
30.0 |
40.0 |
48.0 58.0 |
69.5 75.8 |
70.0 |
69.4 |
59.1 |
39.5 |
26.3 |
50.6 |
|
1898 |
. 30.8 |
30.3 |
39.4 |
48.5 61.5 |
73.6 76.9 |
74.0 |
68.2 |
51.4 |
36.1 |
26.8 |
51.5 |
|
1899 |
. 25.5 |
18.4 |
32.4 |
53.1 63.8 |
71.4 74.4 |
75.3 |
63.1 |
57.2 |
43.8 |
27.8 |
50.5 |
|
1900 |
. 30.1 |
24.0 |
32.6 |
51.2 63.3 |
69.3 74.2 |
78.4 |
68.2 |
59.9 |
39.6 |
29.9 |
51.7 |
156 BULLETIN NO. 532 [April,
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. |
May |
June |
July |
Aug. |
Sept. Oct. |
Nov. |
Dec. Annual |
|
URBANA, Champaign |
county, concluded |
||||||||||
|
1901... |
. . 27.8 |
21.0 |
37.6 |
48.5 |
59.2 |
72.2 |
79.5 |
73.8 |
64.6 53.5 |
35.8 |
24.2 49.8 |
|
1902 |
... 25 7 |
16 8 |
40.8 |
48.1 |
65.8 |
68.4 |
74.6 |
69.4 |
61.7 54.5 |
46.6 |
27 . 0 49 . 9 |
|
1903 |
... 23.8 |
25.6 |
44.2 |
50.8 |
64.0 |
65.5 |
74.8 |
71.6 |
65.6 54.2 |
36.1 |
22.2 49.8 |
|
1904 |
17 9 |
21 7 |
38 4 |
45 2 |
61 2 |
68 8 |
72.5 |
70 3 |
66 1 53 0 |
42.2 |
27 7 48 7 |
|
1905 |
... 19 2 |
16.8 |
44 0 |
50.6 |
62.6 |
71.1 |
72.9 |
74.7 |
67 . 4 52 . 3 |
39.5 |
29.8 50.0 |
|
1906 |
32 3 |
27 4 |
29 0 |
54 1 |
62 2 |
68 9 |
73 2 |
75.3 |
69 1 53.1 |
40 2 |
32 6 51 4 |
|
1907 |
. 31 0 |
28 9 |
46 6 |
42". 6 |
54 4 |
66.7 |
74.2 |
71.2 |
65.0 51.4 |
37.8 |
32 . 1 50 . 2 |
|
1908 |
... 28.8 |
27.2 |
43.0 |
50.3 |
61.8 |
69.2 |
73.9 |
72.8 |
69.1 54.0 |
42.4 |
32.0 52.0 |
|
1909 |
. . . 28.4 |
32.9 |
38.1 |
49.2 |
58.8 |
70.2 |
71.0 |
75.4 |
63.4 49.0 |
49.8 |
20.2 50.5 |
|
1910 |
. . 27 0 |
25 2 |
50 3 |
52 0 |
57 0 |
69 6 |
74.8 |
71.0 |
65.9 57.0 |
36 6 |
25.6 51.0 |
|
1911... |
... 29.4 |
33.7 |
39.6 |
48.5 |
67.4 |
74.4 |
75.3 |
73.0 |
67.8 53.6 |
35.0 |
33.4 52.5 |
|
1912 |
13 8 |
21 5 |
30 4 |
52 3 |
63 8 |
67.4 |
74 2 |
71.4 |
67.6 56.1 |
41.8 |
33.2 49 4 |
|
1913 |
... 30 8 |
24.3 |
37.0 |
51.4 |
63.0 |
72.5 |
78.2 |
77.5 |
69 . 6 52 . 8 |
47.5 |
36 . 3 53 . 4 |
|
1914 |
... 33.6 |
20.4 |
37.1 |
51.7 |
67.5 |
77.6 |
80.5 |
76.4 |
65.5 57.3 |
44.1 |
22.1 52.8 |
|
1915 |
23 7 |
35 9 |
35 4 |
59 3 |
60 5 |
70 6 |
74 1 |
67.4 |
67.9 56 3 |
44 2 |
29 0 52 0 |
|
1916... |
.. 29.7 |
26.6 |
37.4 |
50.6 |
64.0 |
67.9 |
82.3 |
78.2 |
65.2 54.4 |
43.4 |
27.6 52.3 |
|
1917 |
... 28 . 6 |
23.6 |
41.4 |
47.6 |
55.4 |
67.0 |
73.3 |
70.3 |
62.8 45.6 |
42.8 |
21.4 48.3 |
|
1918 |
11 6 |
30 0 |
46 7 |
45 7 |
65 2 |
69 8 |
71.6 |
77.0 |
58.6 57.0 |
42 0 |
38.0 51.1 |
|
1919 |
. . . 31.2 |
31.4 |
41.8 |
51.7 |
59.3 |
73.8 |
77.5 |
71.6 |
69 . 0 57 . 9 |
39.5 |
23 . 8 52 . 4 |
|
1920 |
. . . 20.1 |
28.8 |
40.6 |
44.8 |
59.9 |
71.2 |
73.3 |
71.1 |
68.3 59.6 |
40.0 |
31.0 50.7 |
|
1921 |
. 33 2 |
35 4 |
48.9 |
53 9 |
64.1 |
75.5 |
79.8 |
72.0 |
69.9 54.6 |
42.2 |
33 . 5 55 . 2 |
|
1922 |
... 24.0 |
31.8 |
42.3 |
52.4 |
65.2 |
72.9 |
74.0 |
73.9 |
69.4 57.8 |
43.0 |
30.9 53.1 |
|
1923 |
... 32 . 2 |
24.4 |
36.2 |
49.5 |
59.8 |
71.8 |
75.6 |
72.0 |
65.2 51.1 |
42.6 |
39.8 51.7 |
|
1924 |
20 1 |
29 1 |
35 4 |
52 8 |
55 4 |
68 4 |
71 6 |
73.0 |
61.0 59.6 |
42.0 |
24 0 49.4 |
|
1925 |
... 24.5 |
35.3 |
42.2 |
57.3 |
58.9 |
74.3 |
75.4 |
73.4 |
72.2 45.2 |
38.6 |
27.0 52.0 |
|
1926 |
27 4 |
33 4 |
33 2 |
44 6 |
64 2 |
67 2 |
75 9 |
75 2 |
66 4 53.3 |
37.2 |
27 . 8 50 . 5 |
|
1927 |
25 2 |
37 8 |
43 4 |
51 7 |
60 1 |
66.4 |
73.4 |
67.4 |
70 . 0 58 . 8 |
45.0 |
28.2 52.3 |
|
1928 |
... 27.5 |
32.2 |
39.6 |
46.8 |
61.8 |
65.4 |
74.8 |
74.0 |
61.8 57.2 |
42.4 |
33.4 51.4 |
|
1929 |
21 4 |
23 4 |
46 4 |
54 1 |
58 6 |
68 6 |
75 0 |
70 6 |
64 9 53 0 |
36 6 |
28 7 50.1 |
|
1930 |
20 8 |
39 3 |
38 6 |
54 6 |
63 4 |
70 7 |
78 2 |
76 0 |
68.9 52.8 |
42.2 |
31.0 53.0 |
|
1931... |
... 32.4 |
37.2 |
35.8 |
52.5 |
58.9 |
73.9 |
78.2 |
74.5 |
72.0 59.0 |
50.2 |
39.2 55.3 |
|
1932 |
. . . 35.8 |
37.7 |
33.0 |
52.5 |
63.2 |
72.9 |
76.7 |
74.2 |
65.6 54.2 |
35.6 |
29.4 52.6 |
|
1933 |
. . 37 7 |
28 8 |
39 9 |
51 6 |
63 4 |
77 8 |
78 2 |
73.0 |
72.2 53.0 |
40.4 |
34 . 2 54 . 2 |
|
1934 |
... 32.8 |
24.6 |
35.2 |
51.9 |
67.4 |
78.5 |
80.7 |
73.9 |
64.5 57.9 |
45.9 |
27.7 53.4 |
|
1935 |
... 29.0 |
33.0 |
46.6 |
48.8 |
56.3 |
67.7 |
77.7 |
74.5 |
66.2 55.2 |
40.4 |
24.9 51.7 |
|
1936 . |
... 19.9 |
19.0 |
43.0 |
47 6 |
65.4 |
71.9 |
83.0 |
79.0 |
70.0 54.7 |
38.5 |
34.0 52.2 |
|
1937 |
.. . 28.4 |
28.5 |
37.4 |
50.4 |
62.8 |
70.4 |
74.3 |
76.5 |
65.4 52.0 |
38.0 |
27.8 51.0 |
|
1938 |
27 6 |
37 7 |
47 6 |
53 3 |
61 6 |
69 9 |
76 0 |
75 7 |
68.6 59.9 |
43.8 |
31.3 54.4 |
|
1939 |
... 33.4 |
30.2 |
42.0 |
47.7 |
65.4 |
73.0 |
75.4 |
72.6 |
71.6 56.8 |
41.5 |
34.6 53.7 |
|
1940 |
... 14.2 |
30.5 |
37.0 |
49.4 |
58.5 |
72.6 |
76.0 |
74.8 |
66.0 60.0 |
39.6 |
35.6 51.2 |
|
1941... |
.. 29.8 |
27.2 |
36.1 |
56.4 |
66.0 |
72.8 |
75.1 |
74.4 |
69.4 58.6 |
43.7 |
37.4 53.9 |
|
1942 |
... 27.8 |
27.4 |
43.2 |
55.6 |
62.4 |
71.6 |
76.3 |
72.6 |
65.0 55.8 |
44.2 |
25.0 52.2 |
|
1943 |
. . . 28.0 |
33.3 |
36.6 |
49.8 |
60.8 |
74.8 |
77.4 |
75.8 |
63.0 55.4 |
38.2 |
28.2 51.8 |
|
1944 |
. . 33 2 |
32 2 |
36 4 |
49 8 |
67 2 |
75 8 |
75 6 |
74.0 |
66 . 9 55 . 4 |
43.8 |
24 . 2 52 . 9 |
|
1945 |
... 22.9 |
32.6 |
51.2 |
52.4 |
57.4 |
67.9 |
73.2 |
73.0 |
66.7 53.0 |
41.7 |
23.4 51. 3 |
|
1946 |
28 8 |
33 3 |
51 8 |
54 6 |
58 8 |
71 3 |
74.8 |
70.1 |
66.8 60.4 |
45.4 |
36.0 54.4 |
|
Aver |
26.8 |
28.7 |
39.6 |
50.9 |
61.5 |
71.6 |
75.3 |
73.1 |
66.4 54.5 |
40.8 |
30.2 51.6 |
|
CAIRO, Alexander county |
|||||||||||
|
1872... |
42.9 |
61.8 |
69.3 |
76.1 |
80.6 |
81.3 |
71.4 58.7 |
41.0 |
28.8 |
||
|
1873 |
.. 30.0 |
37.6 |
46.3 |
55.3 |
67.2 |
78.0 |
78.6 |
78.4 |
68.2 54.4 |
44.6 |
40.8 56.6 |
|
1874 |
... 39.6 |
40.2 |
47.4 |
51.5 |
70.5 |
79.6 |
81.1 |
79.4 |
72.4 58.8 |
47.2 |
40.1 59.0 |
|
1875 |
... 28.2 |
32.2 |
44.8 |
54.8 |
65.8 |
74.5 |
79.5 |
74.2 |
68.3 55.8 |
46.0 |
45.5 55.8 |
|
1876 |
... 44.0 |
42.8 |
42.7 |
59.5 |
68.2 |
74.5 |
80.3 |
78.7 |
69.4 56.8 |
43.7 |
26.4 57.3 |
|
1877 |
... 33.4 |
43.5 |
43.5 |
57.2 |
65.4 |
75.1 |
78.3 |
76.5 |
70.0 61.2 |
45.5 |
49.8 58.3 |
|
1878 |
... 39.2 |
43.7 |
57.1 |
63.2 |
67.4 |
73.0 |
81.7 |
80.2 |
69.5 58.7 |
49.0 |
32.3 59.6 |
|
1879 |
... 33.8 |
37.6 |
51.6 |
57.6 |
70.4 |
74.1 |
81.4 |
75.0 |
66.2 65.1 |
51.7 |
40.8 58.8 |
|
1880 |
... 50.7 |
44.8 |
49.0 |
61.8 |
71.7 |
76.0 |
78.4 |
78.2 |
67.0 57.7 |
36.8 |
32.0 58.7 |
1949] CLIMATE OF ILLINOIS: APPENDIX A 157
Table 4. — Average Monthly and Annual Temperatures (Continued)
|
Year |
Jan. |
Feb. |
Mar. |
Apr. May |
June |
July |
Aug. |
Sept. |
Oct. Nov. |
Dec. |
Annual |
|
CAIRO, Alexander county, |
continued |
||||||||||
|
1881 |
. 33.2 |
37.8 |
45.0 |
55.2 72.4 |
75.6 |
82.2 |
83.0 |
70.6 |
65.4 46.9 |
45.4 |
59.4 |
|
1882 |
. 37.9 |
48.9 |
52.2 |
60.8 64.0 |
76.3 |
76.2 |
75.4 |
69.7 |
65.2 49.3 |
37.2 |
59.4 |
|
1883 |
32 0 |
38 5 |
44 3 |
59 8 65 2 |
75 6 |
77 8 |
74 9 |
68 4 |
60 4 50 4 |
42 6 |
57.5 |
|
1884 |
. 27.3 |
41.6 |
47.8 |
56 . 4 66 . 6 |
74.2 |
78.1 |
75.5 |
74 A |
63 . 9 49 . 6 |
36.4 |
57.6 |
|
1885 |
. 30.0 |
32.0 |
43.1 |
60.6 66.2 |
74.5 |
80.2 |
77.0 |
69.6 |
56.6 47.8 |
38.5 |
56.3 |
|
1886 |
. 24.9 |
34.8 |
44.8 |
58.2 69.1 |
72.6 |
78.5 |
77.7 |
71.6 |
60.2 45.4 |
31.2 |
55.8 |
|
1887 |
. 33.1 |
42.8 |
48.0 |
59.7 70.6 |
74.6 |
80.6 |
78.2 |
71.6 |
56.6 46.5 |
36.9 |
58.3 |
|
1888 |
. 32 0 |
32 6 |
44 8 |
61 9 64 4 |
73 4 |
80 0 |
76 0 |
67 4 |
55 8 46 7 |
39.4 |
56 2 |
|
1889 |
. 38.0 |
35.6 |
50.0 |
59 . 6 65 . 8 |
70.8 |
77.4 |
75.1 |
67.0 |
56.6 44.2 |
54.0 |
57.8 |
|
1890 |
. 44.6 |
44.6 |
42.9 |
59.2 66.0 |
79.4 |
79.0 |
75.0 |
66.5 |
58.0 51.0 |
40.0 |
58.8 |
|
1891 |
. 38.5 |
41.7 |
42.8 |
60.4 64 4 |
77.2 |
74.8 |
74.4 |
72.8 |
58.0 44.4 |
45.6 |
57.9 |
|
1892 |
. 29.3 |
44.6 |
44.0 |
58.2 66.0 |
76.7 |
76.7 |
76.2 |
70.0 |
60 . 0 44 . 2 |
36.0 |
56.8 |
|
1893 |
. 29 4 |
36 4 |
47 2 |
60 2 65 0 |
74 8 |
80 1 |
76 5 |
71 2 |
57 9 46 1 |
40 0 |
57 1 |
|
1894 |
. 40.0 |
35.8 |
52 4 |
59.4 65 7 |
76 7 |
77.0 |
78 0 |
71.5 |
60.2 45.4 |
40.8 |
58.6 |
|
1895 |
. 31.4 |
28.4 |
46.9 |
60.3 66.4 |
77.2 |
76.0 |
78.1 |
74.5 |
54.6 46.6 |
40.0 |
56.7 |
|
1896 |
. 37 8 |
39 4 |
43 0 |
65 8 72 9 |
74 4 |
79.6 |
79.1 |
69.4 |
58 3 50.1 |
42.9 |
59.4 |
|
1897 |
. 34.7 |
41.0 |
50.6 |
57 . 8 64 . 6 |
75.4 |
80.0 |
77.6 |
75.8 |
66 . 0 49 . 5 |
36.8 |
59.2 |
|
1898 |
. 41.6 |
40.4 |
51.2 |
55.6 69.3 |
78.0 |
78.4 |
78.0 |
74.2 |
57.6 45.2 |
36.3 |
58.8 |
|
1899 . . . |
34 8 |
27 0 |
44 4 |
58 4 70 5 |
76 6 |
77 8 |
81 0 |
70.1 |
63 8 52.8 |
36.4 |
57.8 |
|
1900 |
. 39.8 |
34.4 |
46.2 |
59.2 68.6 |
74.5 |
78.8 |
81.9 |
75.8 |
65 . 6 49 . 2 |
41.0 |
59.6 |
|
1901 |
39 8 |
34 2 |
46 8 |
54 6 66 0 |
78 6 |
83 4 |
77 0 |
70 9 |
61.4 46 2 |
32 6 |
57.6 |
|
1902 |
. 34 8 |
28.8 |
49.2 |
57 2 73 0 |
75.7 |
80.1 |
77.4 |
67.4 |
62 . 4 54 . 6 |
37.0 |
58.1 |
|
1903 |
. 36.6 |
37.5 |
52.0 |
58.1 68.6 |
69.8 |
79.4 |
77.4 |
71.1 |
60.0 44.5 |
34.0 |
57.4 |
|
1904 |
. 33.6 |
36.2 |
49.1 |
52.6 67.0 |
74.5 |
76.3 |
76.0 |
72.4 |
59.0 48.6 |
38.9 |
57.0 |
|
1905 .... |
. 27 8 |
28 2 |
53 3 |
58 2 69 6 |
76 6 |
75.8 |
78 2 |
72.7 |
59 . 3 49 . 8 |
37.6 |
57.3 |
|
1906 |
. 40.3 |
35.8 |
39.2 |
62.0 68.1 |
74.8 |
76.7 |
77.9 |
74.8 |
58.2 46.5 |
40.2 |
57.9 |
|
1907 |
43 4 |
38 8 |
57 4 |
50 8 61 8 |
73 4 |
80 2 |
77 8 |
70 6 |
58.4 46 9 |
40.8 |
58.4 |
|
1908 .... |
. 36.8 |
39.0 |
53.6 |
59 2 69 0 |
75.2 |
78.6 |
78.2 |
73.3 |
58.8 50.8 |
42.1 |
59.6 |
|
1909 |
. 37.4 |
43.8 |
47.6 |
57.6 65.4 |
76.8 |
79.0 |
81.0 |
69.6 |
59.5 57.3 |
31.0 |
58.8 |
|
1910 |
. 36 3 |
34 4 |
58 8 |
57 5 63 9 |
72 5 |
78 3 |
76 6 |
73 5 |
61 4 45 2 |
35 2 |
57.8 |
|
1911... |
. 41.0 |
43.1 |
50.4 |
57.9 72.4 |
79.3 |
78.4 |
76.6 |
76.7 |
60 . 3 42 . 6 |
41.8 |
60.0 |
|
1912 |
26 6 |
32 0 |
42 0 |
59 0 68 7 |
71 5 |
79 4 |
76 4 |
72 7 |
62 0 48 5 |
39 4 |
56 5 |
|
|