TODAY MAY15
TEMPERATURE61
HUMIDITY63
PRESSURE30.19
WIND COND.190 11.2
  • 7059Sun30%80%
  • 6961Mon70%80%
  • 7363Tue60%50%
  • 8064Wed40%40%
  • 8165Thu40%50%
daynightWeather update from St. Louis Regional Airport at

Key findings

  • 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 9% worse than the national average
  • The pollution index in Dorchester is 77% 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 index544150
      Pollution index1,150,6703,347,2955,066,862

      Dorchester 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

      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.
      Carlinville, IL5,2974020%
      Chesterfield, IL3364020%
      Litchfield, IL6,9764020%
      Royal Lakes, IL134548%
      Livingston, IL807548%
      Dorchester, IL133548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Hico, WV133295490%
      Lakeview, AL1333922%
      Huron, KS1334314%
      Redmon, IL1334510%
      White Oak, NC1333040%
      Dorchester, IL133548%
      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.