TODAY MAY15
TEMPERATURE77
HUMIDITY18
PRESSURE30.16
WIND COND.
  • 7548Sun20%20%
  • 7449Mon
  • 7553Tue
  • 8156Wed
  • 8056Thu
daynightWeather update from Willimantic, Windham Airport at

Key findings

  • The highest monthly average temperature in Colchester for July is 73.5 degrees
  • The lowest monthly average temperature in Colchester for January is 28.7 degrees
  • The most monthly precipitation in Colchester occurs in June with 5 inches
  • The air quality index in Colchester is 34% better than the national average
  • The pollution index in Colchester is 45% better than the national average

Compare Colchester, CT Weather

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      Colchester 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
      January19°F39°F29°F2.7"
      February19°F40°F29°F3.0"
      March28°F49°F38°F3.5"
      April38°F62°F50°F4.0"
      May48°F73°F60°F3.3"
      June57°F79°F68°F5.0"
      July63°F85°F74°F3.9"
      August60°F82°F71°F4.1"
      September54°F77°F65°F3.7"
      October43°F66°F54°F4.4"
      November33°F54°F43°F3.4"
      December26°F44°F34°F4.0"

      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.
      IndexColchesterConnecticutNational
      Air quality index334350
      Pollution index2,806,1507,127,5315,066,862

      Colchester air quality information

      MeasurementTotal
      Days measured334
      Days with good air quality319
      Days with moderate air quality14
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality

      Colchester air quality information

      PollutantTotal
      Arsenic0.004%
      Benzene0.030%
      Carbon Tetrachloride0.010%
      Lead0.040%
      Mercury0.010%

      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.
      Mansfield Center, CT9693334%
      Coventry Lake, CT3,1663334%
      South Coventry, CT1,1423334%
      Willimantic, CT17,3393334%
      South Windham, CT1,3303334%
      Colchester, CT4,4753334%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Clintonville, WI4,4753726%
      Greendale, IN4,475548%
      Brookridge, FL4,4773040%
      Hawaiian Ocean View, HI4,4771668%
      Oak View, CA4,472468%
      Colchester, CT4,4753334%
      Source: The Colchester, CT 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.