TODAY MAY07
TEMPERATURE57
HUMIDITY44
PRESSURE29.99
WIND COND.350 22.3
  • 5640Sat60%
  • 5437Sun60%30%
  • 5636Mon
  • 6039Tue
  • 6343Wed
daynightWeather update from Chicago / Wheeling, Pal-Waukee Airport at

Key findings

  • The highest monthly average temperature in Crystal Lake for July is 73.7 degrees
  • The lowest monthly average temperature in Crystal Lake for January is 23.8 degrees
  • The most monthly precipitation in Crystal Lake occurs in May with 4.5 inches
  • The air quality index in Crystal Lake is 16% better than the national average
  • The pollution index in Crystal Lake is 89% better than the national average

Compare Crystal Lake, IL 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
      January16°F32°F24°F1.4"
      February17°F34°F25°F1.2"
      March30°F49°F38°F2.2"
      April39°F62°F50°F3.8"
      May49°F73°F60°F4.5"
      June59°F82°F70°F4.4"
      July63°F85°F74°F4.1"
      August62°F83°F72°F3.8"
      September54°F77°F65°F3.4"
      October43°F64°F53°F3.1"
      November32°F50°F40°F1.9"
      December21°F36°F29°F2.1"

      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 LakeIllinoisNational
      Air quality index424150
      Pollution index543,5163,347,2955,066,862

      Crystal Lake air quality information

      MeasurementTotal
      Days measured341
      Days with good air quality240
      Days with moderate air quality100
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Crystal Lake air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Greenwood, IL4253726%
      Pistakee Highlands, IL3,2633922%
      Wonder Lake, IL3,7393922%
      Long Lake, IL3,5643922%
      Hainesville, IL3,6713922%
      Crystal Lake, IL40,4754216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Fitchburg, MA40,4414020%
      Warren, OH40,4334216%
      Huntsville, TX40,432524%
      Channelview, TX40,534524%
      Streamwood, IL40,5525510%
      Crystal Lake, IL40,4754216%
      Source: The Crystal Lake, 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.