TODAY MAY17
TEMPERATURE70
HUMIDITY73
PRESSURE30.07
WIND COND.140 9.4
  • 7565Tue70%50%
  • 8164Wed20%20%
  • 8363Thu
  • 8463Fri
  • 8664Sat
daynightWeather update from Marion - Williamson County Regional Airport at

Key findings

  • The highest monthly average temperature in Herrin for July is 78.6 degrees
  • The lowest monthly average temperature in Herrin for January is 34.8 degrees
  • The most monthly precipitation in Herrin occurs in June with 13.3 inches
  • The air quality index in Herrin is 14% better than the national average
  • The pollution index in Herrin is 98% better than the national average

Compare Herrin, IL Weather

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      Herrin 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°F44°F35°F2.5"
      February29°F46°F37°F1.6"
      March40°F59°F49°F4.1"
      April50°F70°F59°F10.7"
      May58°F78°F68°F10.5"
      June67°F87°F77°F13.3"
      July70°F88°F79°F0.5"
      August68°F88°F77°F0.4"
      September61°F81°F70°F1.2"
      October50°F70°F59°F0.8"
      November39°F58°F48°F5.8"
      December32°F47°F39°F1.2"

      Herrin 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.
      IndexHerrinIllinoisNational
      Air quality index434150
      Pollution index125,3593,347,2955,066,862

      Herrin air quality information

      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

      Herrin air quality information

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

      Average monthly Herrin temperature with heat index

      Herrin monthly precipitation with daily maximum

      Herrin monthly snow depth with daily maximum

      Herrin monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Buckner, IL4674314%
      Hanaford, IL3234314%
      Thompsonville, IL6454314%
      Carbondale, IL26,0664314%
      Energy, IL1,1664314%
      Herrin, IL12,8684314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Grenada, MS12,8633334%
      Grass Valley, CA12,8614412%
      Gaffney, SC12,8593628%
      Glendale, WI12,8804412%
      Luling, LA12,8554510%
      Herrin, IL12,8684314%
      Source: The Herrin, 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.