TODAY MAY06
TEMPERATURE54
HUMIDITY59
PRESSURE30.15
WIND COND.250 9.4
  • 6341Thu50%20%
  • 6441Fri
  • 5946Sat70%
  • 5741Sun80%40%
  • 6041Mon
daynightWeather update from Mattoon / Charleston, Coles County Memorial Airport at

Key findings

  • The highest monthly average temperature in Sullivan for August is 77.3 degrees
  • The lowest monthly average temperature in Sullivan for February is 29.1 degrees
  • The most monthly precipitation in Sullivan occurs in October with 8.2 inches
  • The air quality index in Sullivan is 12% better than the national average
  • The pollution index in Sullivan is 86% better than the national average

Compare Sullivan, IL Weather

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      Sullivan 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
      January25°F39°F31°F6.1"
      February23°F37°F29°F2.4"
      March37°F55°F45°F4.1"
      April44°F65°F53°F3.9"
      May55°F77°F65°F2.6"
      June64°F85°F75°F4.7"
      July65°F86°F75°F8.2"
      August68°F88°F77°F7.2"
      September59°F83°F71°F8.1"
      October49°F69°F58°F8.2"
      November36°F54°F44°F3.6"
      December25°F38°F31°F2.6"

      Sullivan 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.
      IndexSullivanIllinoisNational
      Air quality index444150
      Pollution index703,2183,347,2955,066,862

      Sullivan air quality information

      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

      Sullivan air quality information

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

      Average monthly Sullivan temperature with heat index

      Sullivan monthly precipitation with daily maximum

      Sullivan monthly snow depth with daily maximum

      Sullivan monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Gays, IL2934020%
      Shelbyville, IL5,1474020%
      Windsor village, IL9654020%
      Windsor, IL1,4604020%
      Mattoon, IL17,3994020%
      Sullivan, IL4,6754412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Jim Thorpe, PA4,6764216%
      Polson, MT4,6743726%
      La Grange, TX4,6734412%
      Marienville, PA4,673982%
      Becker, MN4,6773236%
      Sullivan, IL4,6754412%
      Source: The Sullivan, 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.