TODAY MAY15
TEMPERATURE54
HUMIDITY62
PRESSURE30.22
WIND COND.100 7.6
  • 6654Sat50%40%
  • 6959Sun50%80%
  • 7360Mon90%70%
  • 7461Tue50%50%
  • 7964Wed50%60%
daynightWeather update from St. Louis Regional Airport at

Key findings

  • The highest monthly average temperature in Chesterfield for July is 75.9 degrees
  • The lowest monthly average temperature in Chesterfield for January is 29.4 degrees
  • The most monthly precipitation in Chesterfield occurs in April with 9.3 inches
  • The air quality index in Chesterfield is 20% better than the national average
  • The pollution index in Chesterfield is 77% better than the national average

Compare Chesterfield, IL Weather

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      Chesterfield 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
      January23°F38°F29°F3.3"
      February24°F40°F31°F3.5"
      March36°F55°F44°F3.9"
      April45°F67°F55°F9.3"
      May55°F75°F64°F5.6"
      June64°F84°F73°F7.9"
      July66°F86°F76°F5.0"
      August65°F86°F74°F5.1"
      September57°F80°F67°F6.0"
      October46°F68°F56°F5.6"
      November36°F54°F44°F3.6"
      December28°F42°F34°F3.6"

      Chesterfield 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.
      IndexChesterfieldIllinoisNational
      Air quality index404150
      Pollution index1,150,6703,347,2955,066,862

      Chesterfield air quality information

      MeasurementTotal
      Days measured360
      Days with good air quality287
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Chesterfield air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Chesterfield temperature with heat index

      Chesterfield monthly precipitation with daily maximum

      Chesterfield monthly snow depth with daily maximum

      Chesterfield monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Carlinville, IL5,2974020%
      Greenfield, IL1,3174020%
      Nilwood, IL2464020%
      Palmyra, IL5794020%
      Hettick, IL1254020%
      Chesterfield, IL3364020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Altoona, KS3363824%
      Imbler, OR3362060%
      Fairlee, VT3363432%
      Enchanted Oaks, TX3364118%
      Polk, NE3361962%
      Chesterfield, IL3364020%
      Source: The Chesterfield, 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.