TODAY JUL05
TEMPERATURE91
HUMIDITY49
PRESSURE29.93
WIND COND.30 13
  • 9272Mon30%30%
  • 9173Tue40%30%
  • 9173Wed
  • 9273Thu30%
  • 8971Fri
daynightWeather update from Mattoon / Charleston, Coles County Memorial Airport at

Key findings

  • The highest monthly average temperature in Charleston for July is 75 degrees
  • The lowest monthly average temperature in Charleston for January is 28 degrees
  • The most monthly precipitation in Charleston occurs in April with 4.9 inches
  • The air quality index in Charleston is 20% better than the national average
  • The pollution index in Charleston is 67% better than the national average

Compare Charleston, IL Weather

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      Charleston 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
      January21°F37°F28°F1.5"
      February22°F39°F30°F1.7"
      March35°F54°F44°F2.1"
      April45°F66°F55°F4.9"
      May55°F75°F64°F3.8"
      June64°F84°F74°F4.7"
      July66°F86°F75°F4.2"
      August64°F85°F74°F2.1"
      September57°F79°F67°F3.0"
      October46°F67°F56°F2.9"
      November35°F53°F44°F2.4"
      December27°F41°F33°F2.4"

      Charleston 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.
      IndexCharlestonIllinoisNational
      Air quality index404150
      Pollution index1,664,3703,347,2955,066,862

      Charleston air quality information

      MeasurementTotal
      Days measured245
      Days with good air quality224
      Days with moderate air quality21
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Charleston air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.030%
      Mercury0.003%

      Average monthly Charleston temperature with heat index

      Charleston monthly precipitation with daily maximum

      Charleston monthly snow depth with daily maximum

      Charleston monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Casey, IL2,5614020%
      Lerna, IL2724020%
      Toledo, IL1,3724020%
      Mattoon, IL17,3994020%
      Neoga, IL1,7704020%
      Charleston, IL21,2574020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Winter Gardens, CA21,2556428%
      Orchards, WA21,2493824%
      Hutto, TX21,2414412%
      Fort Walton Beach, FL21,2383138%
      Marquette, MI21,282884%
      Charleston, IL21,2574020%
      Source: The Charleston, 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.