TODAY SEP25
TEMPERATURE74
HUMIDITY87
PRESSURE29.95
WIND COND.190 4.7
  • 6945Wed
  • 7250Thu
  • 7552Fri
  • 7253Sat
  • 7559Sun
daynightWeather update from Decatur Airport at
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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"

Did you know?

  • The highest monthly average temperature in Harristown for August is 78 degrees.
  • The lowest monthly average temperature in Harristown for February is 29 degrees.
  • The most monthly precipitation in Harristown occurs in June with 8.1 inches.
  • The air quality index in Harristown is 21% better than the national average.
  • The pollution index in Harristown is 86% better than the national average.

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Compare Harristown, IL Weather To Other Cities

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 index394150
Pollution index703,2183,347,2955,066,862

Harristown air quality information

MeasurementTotal
Days measured365
Days with good air quality293
Days with moderate air quality72
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Harristown air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Blue Mound, IL1,0873922%
Decatur, IL74,0633922%
Long Creek, IL1,5083922%
Mount Pulaski, IL1,4443922%
Stonington, IL9133922%
Harristown, IL1,2403922%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Muldraugh, KY1,2404314%
Knights Landing, CA1,2405510%
Dulac, LA1,2403432%
Cleora, OK1,2403726%
The Galena Territory, IL1,2413236%
Harristown, IL1,2403922%
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.