TODAY DEC12
TEMPERATURE38
HUMIDITY73
PRESSURE100580
WIND COND.280 16.6
  • 3720Thu
  • 2915Fri
  • 3215Sat
  • 3526Sun
  • 4435Mon40%40%
daynightWeather update from Willimantic, Windham Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Crystal Lake for July is 74.7 degrees
  • The lowest monthly average temperature in Crystal Lake for January is 28 degrees
  • The most monthly precipitation in Crystal Lake occurs in October with 5.9 inches
  • The air quality index in Crystal Lake is 5% better than the national average
  • The pollution index in Crystal Lake is 3% worse than the national average

Compare Crystal Lake, CT Weather

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      Crystal Lake 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
      January18°F38°F28°F3.3"
      February18°F40°F29°F3.6"
      March26°F50°F38°F3.6"
      April37°F65°F50°F4.0"
      May47°F75°F60°F4.0"
      June57°F82°F69°F5.5"
      July63°F88°F75°F4.9"
      August60°F86°F72°F4.9"
      September54°F80°F66°F3.9"
      October43°F67°F54°F5.9"
      November32°F55°F43°F3.2"
      December24°F44°F33°F4.5"

      Crystal Lake 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.
      IndexCrystal LakeConnecticutNational
      Air quality index404342
      Pollution index2,806,1508,629,8832,726,193

      Crystal Lake air quality

      MeasurementTotal
      Days measured364
      Days with good air quality305
      Days with moderate air quality59
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

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

      Average monthly Crystal Lake temperature with heat index

      Crystal Lake monthly precipitation with daily maximum

      Crystal Lake monthly snow depth with daily maximum

      Crystal Lake monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Coventry Lake, CT2,1353334.0%
      South Coventry, CT1,4133334.0%
      Storrs, CT16,3923334.0%
      Mansfield Center, CT1,3673334.0%
      Somers, CT2,3434020.0%
      Crystal Lake, CT2,5674020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Mattawan, MI2,5673824.0%
      Shelby, MI2,5673824.0%
      Maynardville, TN2,567468.0%
      Labelle, QC2,567n/a 
      Henniker, NH2,5662746.0%
      Crystal Lake, CT2,5674020.0%
      Source: The Crystal Lake, 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.