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Key findings

  • The highest monthly average temperature in Chicago for July is 76.3 degrees
  • The lowest monthly average temperature in Chicago for January is 26.2 degrees
  • The most monthly precipitation in Chicago occurs in August with 5.1 inches
  • The air quality index in Chicago is 11% worse than the national average
  • The pollution index in Chicago is 2843% worse than the national average

Compare Chicago, IL Weather

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      Chicago Average Temperature

      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"

      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 index554150
      Pollution index80,238,7043,148,6942,726,193

      Chicago air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality121
      Days with moderate air quality227
      Days w/ poor A.Q. for sensitive groups16
      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

      CityPopulationAir Quality IndexNational Avg.
      Broadview, IL7,9155510.0%
      Forest Park, IL14,1375510.0%
      Bridgeview, IL16,3815510.0%
      Worth, IL10,7765510.0%
      Palos Heights, IL12,5445510.0%
      Chicago, IL2,714,0175510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Toronto, ON3,013,752n/a 
      Houston, TX2,240,582524.0%
      Montréal, QC1,811,008n/a 
      Philadelphia, PA1,559,938512.0%
      Phoenix, AZ1,555,3247448.0%
      Chicago, IL2,714,0175510.0%
      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.