TODAY NOV21
TEMPERATURE67
HUMIDITY76
PRESSURE100850
WIND COND.140 18.4
  • 4730Fri
  • 5335Sat
  • 6252Sun
  • 6330Mon
  • 4629Tue
daynightWeather update from Harrisburg-Raleigh Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Harrisburg for July is 76.9 degrees
  • The lowest monthly average temperature in Harrisburg for January is 34.2 degrees
  • The most monthly precipitation in Harrisburg occurs in April with 10.6 inches
  • The air quality index in Harrisburg is 2% worse than the national average
  • The pollution index in Harrisburg is 95% better than the national average

Compare Harrisburg, IL Weather

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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"

      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 index434142
      Pollution index125,3593,148,6942,726,193

      Harrisburg air quality

      MeasurementTotal
      Days measured344
      Days with good air quality269
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Eldorado, IL4,0004314.0%
      Thompsonville, IL5274314.0%
      Galatia, IL1,0954314.0%
      Crab Orchard, IL2224314.0%
      Raleigh, IL2684314.0%
      Harrisburg, IL8,5784314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Hailey, ID8,5752060.0%
      Richmond Heights, MO8,581548.0%
      Berthoud, CO8,574484.0%
      Mount Pleasant, IA8,5742942.0%
      Stony Brook University, NY8,5744314.0%
      Harrisburg, IL8,5784314.0%
      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.