TODAY MAY16
TEMPERATURE65
HUMIDITY50
PRESSURE30.19
WIND COND.170 7.6
  • 7159Mon80%70%
  • 7361Tue50%50%
  • 8264Wed30%
  • 8465Thu30%
  • 8564Fri
daynightWeather update from Logan County Airport at

Key findings

  • The highest monthly average temperature in McLean for July is 75.7 degrees
  • The lowest monthly average temperature in McLean for January is 27.8 degrees
  • The most monthly precipitation in McLean occurs in September with 11.5 inches
  • The air quality index in McLean is 12% better than the national average
  • The pollution index in McLean is 88% better than the national average

Compare McLean, IL Weather

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      McLean 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
      January20°F37°F28°F2.6"
      February21°F39°F29°F3.2"
      March34°F55°F43°F4.1"
      April44°F67°F55°F6.7"
      May54°F76°F65°F4.6"
      June63°F85°F74°F8.5"
      July66°F87°F76°F11.2"
      August64°F86°F74°F8.1"
      September56°F80°F67°F11.5"
      October46°F68°F56°F6.3"
      November34°F54°F43°F5.1"
      December25°F40°F32°F5.3"

      McLean 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.
      IndexMcLeanIllinoisNational
      Air quality index444150
      Pollution index607,2623,347,2955,066,862

      McLean air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality256
      Days with moderate air quality108
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      McLean air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.001%
      Lead0.000%
      Mercury0.000%

      Average monthly McLean temperature with heat index

      McLean monthly precipitation with daily maximum

      McLean monthly snow depth with daily maximum

      McLean monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Lincoln, IL14,2534020%
      Hartsburg, IL2514412%
      Wapella, IL5574412%
      Hopedale, IL8714412%
      Beason, IL704412%
      McLean, IL7794412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Hadley, NY7793726%
      East Ellijay, GA7794314%
      Kindred, ND7793334%
      Trimont, MN7793236%
      Pine Harbor, TX7793824%
      McLean, IL7794412%
      Source: The McLean, 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.