TODAY FEB25
TEMPERATURE43
HUMIDITY76
PRESSURE30.23
WIND COND.360 13
  • 4933Thu
  • 5040Fri20%30%
  • 6047Sat20%40%
  • 6038Sun
  • 5231Mon
daynightWeather update from Marion - Williamson County Regional Airport at

Key findings

  • The highest monthly average temperature in Simpson for July is 78 degrees
  • The lowest monthly average temperature in Simpson for January is 36 degrees
  • The most monthly precipitation in Simpson occurs in April with 8.6 inches
  • The air quality index in Simpson is 12% better than the national average
  • The pollution index in Simpson is 98% better than the national average

Compare Simpson, IL Weather

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      Simpson 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
      January28°F46°F36°F5.4"
      February30°F48°F38°F3.9"
      March40°F60°F49°F7.8"
      April49°F72°F60°F8.6"
      May58°F79°F67°F6.3"
      June67°F88°F77°F6.6"
      July69°F88°F78°F6.4"
      August67°F88°F77°F6.0"
      September59°F82°F70°F5.5"
      October48°F72°F59°F5.5"
      November38°F59°F47°F5.8"
      December32°F48°F39°F6.3"

      Simpson 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.
      IndexSimpsonIllinoisNational
      Air quality index444150
      Pollution index125,3593,347,2955,066,862

      Simpson air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality261
      Days with moderate air quality103
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Simpson air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.003%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Simpson temperature with heat index

      Simpson monthly precipitation with daily maximum

      Simpson monthly snow depth with daily maximum

      Simpson monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Golconda, IL8194412%
      Goreville, IL1,1784412%
      Stonefort, IL4204412%
      Belknap, IL544412%
      Karnak, IL6014412%
      Simpson, IL804412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Penermon, MO802648%
      Stockholm, WI803726%
      Benedict, ND803628%
      Playas, NM801276%
      Maiden Rock, WI803726%
      Simpson, IL804412%
      Source: The Simpson, 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.