TODAY MAY29
TEMPERATURE75
HUMIDITY50
PRESSURE30.05
WIND COND.290 15
  • 7253Sat
  • 7457Sun
  • 7764Mon
  • 8769Tue
  • 9071Wed20%
daynightWeather update from St. Louis Regional Airport at
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Dorchester 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
January23°F38°F29°F3.3"
February24°F40°F31°F3.5"
March36°F55°F44°F3.9"
April45°F67°F55°F9.3"
May55°F75°F64°F5.6"
June64°F84°F73°F7.9"
July66°F86°F76°F5.0"
August65°F86°F74°F5.1"
September57°F80°F67°F6.0"
October46°F68°F56°F5.6"
November36°F54°F44°F3.6"
December28°F42°F34°F3.6"

Did you know?

  • The highest monthly average temperature in Dorchester for July is 76 degrees.
  • The lowest monthly average temperature in Dorchester for January is 29 degrees.
  • The most monthly precipitation in Dorchester occurs in April with 9.3 inches.
  • The air quality index in Dorchester is 21% worse than the national average.
  • The pollution index in Dorchester is 77% better than the national average.

Compare Dorchester, IL Weather To Other Cities

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      Dorchester 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.
      IndexDorchesterIllinoisNational
      Air quality index604150
      Pollution index1,150,6703,347,2955,066,862

      Dorchester air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality99
      Days with moderate air quality231
      Days w/ poor A.Q. for sensitive groups33
      Days with unhealthy air quality2

      Dorchester air quality information

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

      Average monthly Dorchester temperature with heat index

      Dorchester monthly precipitation with daily maximum

      Dorchester monthly snow depth with daily maximum

      Dorchester monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Litchfield, IL6,9763530%
      Carlinville, IL5,2973530%
      Chesterfield, IL3363530%
      Alhambra, IL5236020%
      Brighton, IL2,3166020%
      Dorchester, IL1336020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Hico, WV133295490%
      White Oak, NC1333040%
      Redmon, IL13350= 100
      Libertyville, AL1333138%
      Patch Grove, WI1333236%
      Dorchester, IL1336020%
      Source: The Dorchester, 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.