TODAY DEC22
TEMPERATURE25
HUMIDITY74
PRESSURE102980
WIND COND.100 9.4
  • 3730Sun
  • 4531Mon
  • 4336Tue60%
  • 464250%
  • 5245Thu40%
daynightWeather update from Decatur Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Harristown for August is 78.1 degrees
  • The lowest monthly average temperature in Harristown for February is 29.4 degrees
  • The most monthly precipitation in Harristown occurs in June with 8.1 inches
  • The air quality index in Harristown is 5% worse than the national average
  • The pollution index in Harristown is 74% better than the national average

Compare Harristown, IL Weather

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      Harristown 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
      January24°F38°F31°F6.8"
      February23°F37°F29°F3.4"
      March35°F56°F45°F3.0"
      April43°F65°F54°F4.2"
      May54°F78°F66°F3.1"
      June64°F86°F75°F8.1"
      July65°F86°F76°F4.0"
      August68°F89°F78°F3.9"
      September59°F85°F72°F7.7"
      October49°F71°F60°F7.1"
      November37°F56°F45°F6.1"
      December24°F37°F30°F2.5"

      Harristown 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.
      IndexHarristownIllinoisNational
      Air quality index444142
      Pollution index703,2183,148,6942,726,193

      Harristown air quality

      MeasurementTotal
      Days measured365
      Days with good air quality255
      Days with moderate air quality110
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

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

      Average monthly Harristown temperature with heat index

      Harristown monthly precipitation with daily maximum

      Harristown monthly snow depth with daily maximum

      Harristown monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Macon, IL1,0914412.0%
      Illiopolis, IL7674412.0%
      Argenta, IL1,0514412.0%
      Warrensburg, IL1,2614412.0%
      Blue Mound, IL1,1354412.0%
      Harristown, IL1,2944412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Canton Valley, CT1,2944118.0%
      Glenns Ferry, ID1,2942060.0%
      Bonneau Beach, SC1,2943824.0%
      Coldwell, MB1,294n/a 
      Brookdale, CA1,2933530.0%
      Harristown, IL1,2944412.0%
      Source: The Harristown, 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.