TODAY DEC12
TEMPERATURE31
HUMIDITY82
PRESSURE30.03
WIND COND.100 6.9
  • 3426Wed100%
  • 3933Thu70%
  • 4028Fri50%
  • 4127Sat
  • 4026Sun
daynightWeather update from Chicago/Waukegan Regional Airport at

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McHenry 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°F33°F25°F1.5"
March28°F45°F36°F2.6"
April37°F57°F46°F4.1"
May47°F68°F57°F3.7"
June57°F77°F67°F4.5"
July63°F82°F72°F4.4"
August62°F80°F71°F3.7"
September55°F73°F64°F3.3"
October44°F62°F52°F3.4"
November33°F49°F40°F2.0"
December22°F36°F29°F2.5"

Did you know?

  • The highest monthly average temperature in McHenry for July is 72 degrees.
  • The lowest monthly average temperature in McHenry for January is 24 degrees.
  • The most monthly precipitation in McHenry occurs in June with 4.5 inches.
  • The air quality index in McHenry is 29% better than the national average.
  • The pollution index in McHenry is 89% better than the national average.

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Compare McHenry, IL Weather To Other Cities

McHenry 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.
IndexMcHenryIllinoisNational
Air quality index354150
Pollution index543,5163,347,2955,066,862

McHenry air quality information

MeasurementTotal
Days measured189
Days with good air quality178
Days with moderate air quality11
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

McHenry air quality information

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

Average monthly McHenry temperature with heat index

McHenry monthly precipitation with daily maximum

McHenry monthly snow depth with daily maximum

McHenry monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Lake in the Hills, IL28,9083138%
Union, IL4843138%
Algonquin, IL30,4133138%
Bull Valley, IL1,2133138%
Crystal Lake, IL40,4753138%
McHenry, IL26,6313530%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Middle River, MD26,631468%
Casselberry, FL26,6493628%
Vineyard, CA26,6505510%
Syracuse, UT26,668492%
Ilchester, MD26,674468%
McHenry, IL26,6313530%
Source: The McHenry, 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.