Climate and Average Weather Year Round in Illinois United States

We show the climate in Illinois by comparing the average weather in 3 representative places: Chicago, Springfield, and Carbondale.

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Chicago
Illinois, United States
Springfield
Illinois, United States
Carbondale
Illinois, United States
Map

Average High and Low Temperature in Illinois

Average High and Low Temperature in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F71228333688635268942NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The daily average high and low air temperature at 2 meters above the ground.
HighJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 33°F36°F46°F57°F67°F77°F82°F80°F74°F62°F49°F37°F
Springfield 36°F40°F53°F65°F75°F83°F86°F84°F78°F66°F52°F40°F
Carbondale 42°F47°F58°F69°F77°F86°F89°F87°F80°F69°F57°F46°F
LowJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 22°F25°F34°F44°F54°F64°F70°F69°F61°F50°F38°F27°F
Springfield 21°F25°F35°F45°F55°F64°F67°F65°F57°F46°F36°F26°F
Carbondale 27°F30°F39°F48°F58°F66°F69°F67°F58°F48°F39°F30°F

Chicago

Average Hourly Temperature in ChicagoJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingvery coldcoldcoldcoolcoolcomfortablewarmvery coldfreezing

Springfield

Average Hourly Temperature in SpringfieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingcoldcoldcoolcoolcomfortablewarmvery coldvery coldfreezing

Carbondale

Average Hourly Temperature in CarbondaleJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingvery coldcoldcoldcoolcoolcomfortablewarmhotfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Chance of Clearer Skies in Illinois

Chance of Clearer Skies in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%68414447NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds).
Clearer SkiesJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 41%44%47%48%50%57%65%67%66%59%49%43%
Springfield 46%46%49%53%53%58%66%69%68%61%52%46%
Carbondale 49%48%51%55%53%58%66%69%68%63%55%49%

Daily Chance of Precipitation in Illinois

Daily Chance of Precipitation in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%3715394019NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The percentage of days in which precipitation is observed, excluding trace quantities.
Days of Precip.JanFebMarAprMayJunJulAugSepOctNovDec
Chicago 5.1d4.7d7.1d8.7d10.7d10.6d10.9d10.2d8.6d7.9d7.2d6.3d
Springfield 4.9d5.0d7.7d9.9d11.6d11.3d10.3d9.5d7.9d7.7d7.1d6.5d
Carbondale 6.4d6.0d8.6d10.3d11.9d10.7d10.6d8.9d7.6d8.0d7.8d7.7d

Average Monthly Rainfall in Illinois

Average Monthly Rainfall in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 in4.0 in4.0 in4.5 in4.5 in5.0 in5.0 in3.70.94.04.62.3NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.
RainfallJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 1.0″1.1″1.8″3.0″3.5″3.5″3.3″3.5″3.1″2.7″2.5″1.6″
Springfield 1.2″1.4″2.1″3.4″3.9″3.8″3.2″3.0″2.9″2.7″2.7″1.9″
Carbondale 2.4″2.5″3.4″4.3″4.4″3.6″3.1″2.5″2.8″3.2″3.7″3.3″

Average Monthly Snowfall in Illinois

Average Monthly Snowfall in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in3.44.0NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The average snowfall accumulated over the course of a sliding 31-day period centered on the day in question.
SnowfallJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 3.0″3.2″1.2″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.3″2.0″
Springfield 3.9″3.3″1.6″0.2″0.0″0.0″0.0″0.0″0.0″0.0″0.7″3.3″
Carbondale 3.1″3.3″1.0″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.3″2.3″

Hours of Daylight in Illinois

Hours of Daylight in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec4 hr4 hr6 hr6 hr8 hr8 hr10 hr10 hr12 hr12 hr14 hr14 hr16 hr16 hr18 hr18 hr20 hr20 hr15.29.1NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The number of hours during which the Sun is at least partly above the horizon.
DaylightJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 9.6h10.6h12.0h13.4h14.6h15.2h14.8h13.8h12.4h11.0h9.8h9.2h
Springfield 9.7h10.7h12.0h13.3h14.4h15.0h14.6h13.6h12.4h11.1h10.0h9.4h
Carbondale 9.9h10.8h12.0h13.2h14.3h14.7h14.4h13.5h12.4h11.2h10.1h9.6h

Chance of Muggy Conditions in Illinois

Chance of Muggy Conditions in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%506478NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).
Muggy daysJanFebMarAprMayJunJulAugSepOctNovDec
Chicago 0.0d0.0d0.0d0.0d1.1d7.1d14.1d13.6d5.5d0.5d0.0d0.0d
Springfield 0.0d0.0d0.0d0.3d3.6d12.3d19.0d16.1d6.5d0.7d0.0d0.0d
Carbondale 0.0d0.0d0.1d0.7d6.7d16.9d23.5d20.7d9.7d1.6d0.2d0.0d

Average Wind Speed in Illinois

Average Wind Speed in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph14.48.512.47.110.15.7NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The average of mean hourly wind speeds at 10 meters above the ground.
Wind Speed (mph)JanFebMarAprMayJunJulAugSepOctNovDec
Chicago 14.213.613.112.410.89.48.78.810.512.313.613.9
Springfield 11.611.612.111.910.18.67.57.48.610.111.211.2
Carbondale 9.69.810.09.68.16.75.96.06.98.08.99.1

Average Water Temperature in Illinois

Average Water Temperature in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F7235NaNNaNNowNowChicagoChicago
The daily average wide-area surface water temperature.
Water Temp.JanFebMarAprMayJunJulAugSepOctNovDec
Chicago 38°F36°F36°F39°F45°F57°F69°F72°F67°F58°F48°F42°F

Tourism Score in Illinois

Tourism Score in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.26.60.1NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F.

Beach/Pool Score in Illinois

Beach/Pool Score in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.45.8NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Growing Season in Illinois

Growing Season in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0%0%20%20%40%40%60%60%80%80%100%100%NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The percentage chance that a given day is within the growing season, defined as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Growing Degree Days in Illinois

Growing Degree Days in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°FNowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The average growing degree days accumulated over the course of the year, where growing degree days are defined as the integral of warmth above a base temperature (50°F in this case).

Average Daily Incident Shortwave Solar Energy in Illinois

Average Daily Incident Shortwave Solar Energy in IllinoisJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh7.01.61.9NowNowChicagoChicagoSpringfieldSpringfieldCarbondaleCarbondale
The average daily shortwave solar energy reaching the ground per square meter.
Solar Energy (kWh)JanFebMarAprMayJunJulAugSepOctNovDec
Chicago 1.92.84.15.36.26.86.76.04.93.42.21.7
Springfield 2.23.14.45.56.26.76.86.25.13.82.52.0
Carbondale 2.43.34.55.76.36.76.76.25.34.02.82.2

This report illustrates the typical weather for Chicago, Springfield, and Carbondale year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used on this page vary between places and are discussed in detail on each place's dedicated page:

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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