TODAY JUL23
TEMPERATURE66
HUMIDITY87
PRESSURE29.93
WIND COND.330 5.8
  • 8462Tue
  • 8463Wed
  • 7857Thu
  • 7658Fri
  • 7859Sat
daynightWeather update from Chicago / Wheeling, Pal-Waukee Airport at

Crystal Lake 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
January-22°F64°F25°F1.5"
February-11°F62°F26°F1.8"
March9°F79°F38°F2.1"
April21°F82°F50°F3.2"
May28°F91°F60°F3.1"
June39°F97°F71°F2.8"
July48°F100°F73°F2.7"
August43°F97°F73°F3.5"
September36°F95°F66°F3.6"
October25°F88°F53°F2.7"
November10°F73°F42°F1.5"
December-6°F61°F27°F2.0"

Did you know?

  • The highest monthly average temperature in Crystal Lake for July is 73 degrees.
  • The lowest monthly average temperature in Crystal Lake for January is 25 degrees.
  • The most monthly precipitation in Crystal Lake occurs in September with 3.6 inches.
  • The air quality index in Crystal Lake is 37% better than the national average.
  • The pollution index in Crystal Lake is 89% better than the national average.

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Compare Crystal Lake, IL Weather To Other Cities

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 index314150
Pollution index543,5163,347,2955,066,862

Crystal Lake air quality information

MeasurementTotal
Days measured365
Days with good air quality339
Days with moderate air quality26
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

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.
Hampshire, IL5,7323138%
Woodstock, IL25,2323138%
Gilberts, IL7,4793138%
Harvard, IL9,5893138%
Huntley, IL25,8313138%
Crystal Lake, IL40,4753138%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Fitchburg, MA40,4413824%
Warren, OH40,4334510%
Huntsville, TX40,432524%
Channelview, TX40,534524%
Streamwood, IL40,5526020%
Crystal Lake, IL40,4753138%
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.