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Key findings

  • The highest monthly average temperature in Flat Rock for July is 76 degrees
  • The lowest monthly average temperature in Flat Rock for January is 31 degrees
  • The most monthly precipitation in Flat Rock occurs in April with 7.6 inches
  • The air quality index in Flat Rock is 28% better than the national average
  • The pollution index in Flat Rock is 90% better than the national average

Compare Flat Rock, IL Weather

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      Flat Rock 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°F40°F31°F5.3"
      February24°F43°F33°F3.4"
      March36°F57°F45°F4.0"
      April46°F69°F56°F7.6"
      May56°F77°F66°F6.3"
      June64°F86°F75°F6.7"
      July66°F87°F76°F5.7"
      August63°F86°F74°F4.9"
      September56°F82°F67°F5.9"
      October46°F70°F57°F5.6"
      November35°F56°F44°F5.6"
      December28°F44°F35°F4.9"

      Flat Rock 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.
      IndexFlat RockIllinoisNational
      Air quality index364150
      Pollution index500,0043,347,2955,066,862

      Flat Rock air quality information

      MeasurementTotal
      Days measured359
      Days with good air quality328
      Days with moderate air quality31
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Flat Rock air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.020%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Flat Rock temperature with heat index

      Flat Rock monthly precipitation with daily maximum

      Flat Rock monthly snow depth with daily maximum

      Flat Rock monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Oaktown, IN6903628%
      Robinson, IL7,4473628%
      Lawrenceville, IL4,4643628%
      Emison, IN1273628%
      Stoy, IL1303628%
      Flat Rock, IL3293628%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Custer City, OK3294314%
      Kanarraville, UT3294412%
      Lakeland Shores, MN329468%
      Great Cacapon, WV3294020%
      Florence, SD3292550%
      Flat Rock, IL3293628%
      Source: The Flat Rock, 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.