TODAY MAY17
TEMPERATURE70
HUMIDITY73
PRESSURE30.06
WIND COND.160 14.8
  • 7562Tue60%50%
  • 8063Wed30%40%
  • 8363Thu20%20%
  • 8363Fri20%
  • 8564Sat20%20%
daynightWeather update from Sparta Community-Hunter Field Airport at

Key findings

  • 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 9% worse than the national average
  • The pollution index in Chester is 85% 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 index544150
      Pollution index753,4733,347,2955,066,862

      Chester air quality information

      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

      Chester air quality information

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Percy, IL8034314%
      Rockwood, IL314314%
      Steeleville, IL2,3274314%
      Cutler, IL4074314%
      Willisville, IL5484314%
      Chester, IL8,599548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Florence, OR8,5971962%
      Four Corners, MD8,596476%
      Sugarmill Woods, FL8,5963040%
      Orange Park, FL8,6034314%
      Willowbrook, IL8,6035510%
      Chester, IL8,599548%
      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.