TODAY NOV09
TEMPERATURE54
HUMIDITY
PRESSURE
WIND COND.120 18.4
  • 6341Sun
  • 6241
  • 6044Tue
  • 6341Wed40%20%
  • 5838Thu
daynightWeather update from St. Louis Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Dorchester for July is 75.9 degrees
  • The lowest monthly average temperature in Dorchester for January is 29.4 degrees
  • The most monthly precipitation in Dorchester occurs in April with 9.3 inches
  • The air quality index in Dorchester is 28% worse than the national average
  • The pollution index in Dorchester is 58% better than the national average

Compare Dorchester, IL Weather

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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"

      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 index544142
      Pollution index1,150,6703,148,6942,726,193

      Dorchester 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%
      Benzene0.030%
      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

      CityPopulationAir Quality IndexNational Avg.
      Carlinville, IL5,6454020.0%
      Chesterfield, IL2084020.0%
      Litchfield, IL6,6264020.0%
      Medora, IL323548.0%
      Bunker Hill, IL1,468548.0%
      Dorchester, IL151548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Kobuk, AK1513824.0%
      Cutter, AZ1516020.0%
      North San Juan, CA1514412.0%
      Winterhaven, CA1514510.0%
      Montezuma, CO151476.0%
      Dorchester, IL151548.0%
      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.