TODAY AUG19
TEMPERATURE81
HUMIDITY71
PRESSURE29.99
WIND COND.
  • 8568Sun
  • 7964Mon70%70%
  • 7857Tue20%
  • 7856Wed
  • 8060Thu
daynightWeather update from Macomb Municipal Airport at

Colchester Average Weather

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
January18°F35°F26°F3.6"
February19°F38°F27°F3.0"
March33°F53°F42°F3.4"
April43°F67°F54°F5.4"
May53°F76°F64°F7.4"
June63°F84°F73°F10.8"
July65°F85°F75°F8.6"
August63°F84°F73°F8.8"
September55°F80°F66°F8.0"
October44°F68°F55°F8.3"
November33°F54°F42°F6.4"
December23°F38°F30°F5.1"

Did you know?

  • The highest monthly average temperature in Colchester for July is 75 degrees.
  • The lowest monthly average temperature in Colchester for January is 26 degrees.
  • The most monthly precipitation in Colchester occurs in June with 10.8 inches.
  • The air quality index in Colchester is 19% better than the national average.
  • The pollution index in Colchester is 84% better than the national average.

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Compare Colchester, IL Weather To Other Cities

Colchester 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.
IndexColchesterIllinoisNational
Air quality index404150
Pollution index802,1143,347,2955,066,862

Colchester air quality information

MeasurementTotal
Days measured110
Days with good air quality71
Days with moderate air quality39
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Colchester air quality information

PollutantTotal
Arsenic0.001%
Benzene0.040%
Carbon Tetrachloride0.000%
Lead0.000%
Mercury0.000%

Average monthly Colchester temperature with heat index

Colchester monthly precipitation with daily maximum

Colchester monthly snow depth with daily maximum

Colchester monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bowen, IL4703432%
Littleton, IL1583432%
Augusta, IL4553432%
Tennessee, IL1204020%
Good Hope, IL3964020%
Colchester, IL1,4924020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Chapel Hill, TN1,4923138%
Fort Hancock, TX1,491512%
Millbrook, NY1,4913628%
Woodcreek, TX1,4914118%
Mercersburg, PA1,4933628%
Colchester, IL1,4924020%
Source: The Colchester, 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.