TODAY OCT21
TEMPERATURE29
HUMIDITY91
PRESSURE30.41
WIND COND.
  • 5533Sun
  • 6342Mon
  • 6438Tue
  • 5740Wed
  • 5339Thu
daynightWeather update from Marion - Williamson County Regional Airport at
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Harrisburg 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
January27°F43°F34°F5.0"
February28°F46°F36°F4.8"
March39°F59°F48°F4.5"
April48°F70°F58°F10.6"
May57°F78°F67°F6.0"
June66°F87°F76°F7.6"
July67°F88°F77°F6.8"
August65°F87°F76°F5.4"
September58°F82°F69°F6.5"
October47°F71°F58°F3.5"
November37°F58°F47°F6.2"
December31°F47°F38°F8.9"

Did you know?

  • The highest monthly average temperature in Harrisburg for July is 77 degrees.
  • The lowest monthly average temperature in Harrisburg for January is 34 degrees.
  • The most monthly precipitation in Harrisburg occurs in April with 10.6 inches.
  • The air quality index in Harrisburg is 21% better than the national average.
  • The pollution index in Harrisburg is 97% better than the national average.

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Compare Harrisburg, IL Weather To Other Cities

Harrisburg 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.
IndexHarrisburgIllinoisNational
Air quality index394150
Pollution index125,3593,347,2955,066,862

Harrisburg air quality information

MeasurementTotal
Days measured243
Days with good air quality204
Days with moderate air quality39
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Harrisburg air quality information

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

Average monthly Harrisburg temperature with heat index

Harrisburg monthly precipitation with daily maximum

Harrisburg monthly snow depth with daily maximum

Harrisburg monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
New Burnside, IL2073628%
Carrier Mills, IL2,1293628%
Stonefort, IL4203628%
Eldorado, IL4,1343922%
Thompsonville, IL6453922%
Harrisburg, IL9,4183922%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Prineville, OR9,4193530%
Lowell, IN9,4236020%
Warren, PA9,4071962%
Pleasant Hill, IA9,4064118%
Lake Mohawk, NJ9,4323922%
Harrisburg, IL9,4183922%
Source: The Harrisburg, 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.