TODAY NOV14
TEMPERATURE53
HUMIDITY79
PRESSURE101659.39
WIND COND.310 9.3
  • 5839Fri
  • 6146Sat
  • 6952Sun
  • 6957Mon90%
  • 7045Tue20%30%
daynightWeather update from Perryville Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Chester for July is 78 degrees
  • The lowest monthly average temperature in Chester for January is 32.9 degrees
  • The most monthly precipitation in Chester occurs in August with 10.7 inches
  • The air quality index in Chester is 28% worse than the national average
  • The pollution index in Chester is 72% better than the national average

Compare Chester, IL Weather

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      Chester 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°F42°F33°F4.6"
      February27°F45°F35°F2.4"
      March39°F58°F48°F3.7"
      April48°F69°F58°F6.6"
      May57°F77°F66°F10.0"
      June66°F86°F76°F8.8"
      July69°F88°F78°F6.8"
      August67°F87°F76°F10.7"
      September59°F81°F69°F7.4"
      October48°F70°F58°F9.0"
      November38°F57°F47°F6.5"
      December30°F45°F37°F7.7"

      Chester 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.
      IndexChesterIllinoisNational
      Air quality index544142
      Pollution index753,4733,148,6942,726,193

      Chester air quality

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic0.001%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.020%
      Mercury0.020%

      Average monthly Chester temperature with heat index

      Chester monthly precipitation with daily maximum

      Chester monthly snow depth with daily maximum

      Chester monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Percy, IL1,1104314.0%
      Rockwood, IL254314.0%
      Steeleville, IL1,8704314.0%
      Cutler, IL4294314.0%
      Willisville, IL5964314.0%
      Chester, IL8,264548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Mammoth Lakes, CA8,263476.0%
      Orting, WA8,2673040.0%
      Four Corners, MD8,268476.0%
      Lac la Biche County, AB8,268n/a 
      Spotswood, NJ8,2554118.0%
      Chester, IL8,264548.0%
      Source: The Chester, 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.