TODAY FEB27
TEMPERATURE34
HUMIDITY88
PRESSURE29.83
WIND COND.220 9.4
  • 4635Sat
  • 4722Sun
  • 3515Mon
  • 4231Tue
  • 4928Wed
daynightWeather update from Chicago/Waukegan Regional Airport at

Key findings

  • 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 22% better than the national average
  • The pollution index in McHenry is 89% better than the national average

Compare McHenry, IL Weather

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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"

      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 index394150
      Pollution index543,5163,347,2955,066,862

      McHenry air quality information

      MeasurementTotal
      Days measured203
      Days with good air quality174
      Days with moderate air quality28
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      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.
      Bloomfield, WI4,7003726%
      Fontana-on-Geneva Lake, WI1,6363726%
      Greenwood, IL4253726%
      Hebron, IL1,2883726%
      Antioch, IL14,3423922%
      McHenry, IL26,6313922%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Middle River, MD26,631468%
      Casselberry, FL26,6493922%
      Vineyard, CA26,650524%
      Syracuse, UT26,6684510%
      Ilchester, MD26,674468%
      McHenry, IL26,6313922%
      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.