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Chicago Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January20°F34°F26°F1.9"
February21°F36°F28°F1.6"
March33°F49°F40°F2.4"
April42°F62°F51°F3.6"
May52°F73°F61°F4.3"
June63°F82°F72°F4.6"
July68°F86°F76°F3.5"
August67°F83°F75°F5.1"
September60°F77°F68°F2.8"
October48°F65°F55°F3.9"
November36°F51°F43°F2.2"
December25°F37°F31°F2.2"

Did you know?

  • The highest monthly average temperature in Chicago for July is 76 degrees.
  • The lowest monthly average temperature in Chicago for January is 26 degrees.
  • The most monthly precipitation in Chicago occurs in August with 5.1 inches.
  • The air quality index in Chicago is 20% worse than the national average.
  • The pollution index in Chicago is 1483% worse than the national average.

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Compare Chicago, IL Weather To Other Cities

Chicago air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexChicagoIllinoisNational
Air quality index604150
Pollution index80,238,7043,347,2955,066,862

Chicago air quality information

MeasurementTotal
Days measured365
Days with good air quality72
Days with moderate air quality281
Days w/ poor A.Q. for sensitive groups11
Days with unhealthy air quality1

Chicago air quality information

PollutantTotal
Arsenic0.760%
Benzene0.560%
Carbon Tetrachloride0.280%
Lead0.480%
Mercury0.480%

Average monthly Chicago temperature with heat index

Chicago monthly precipitation with daily maximum

Chicago monthly snow depth with daily maximum

Chicago monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Alsip, IL19,3356020%
Berwyn, IL56,4146020%
Burbank, IL29,0876020%
Cicero, IL83,9726020%
Evanston, IL75,4726020%
Chicago, IL2,714,0176020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Houston, TX2,240,582524%
Philadelphia, PA1,559,9385714%
Phoenix, AZ1,555,3247448%
Los Angeles, CA3,918,8727448%
San Antonio, TX1,439,3584510%
Chicago, IL2,714,0176020%
Source: The Chicago, IL weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.