TODAY MAY12
TEMPERATURE37
HUMIDITY83
PRESSURE30.46
WIND COND.20 5.4
  • 6844Thu
  • 6949Fri
  • 6752Sat
  • 7156Sun
  • 7256Mon
daynightWeather update from Lewis University Airport at

Key findings

  • The highest monthly average temperature in Darien for July is 73.4 degrees
  • The lowest monthly average temperature in Darien for January is 24.4 degrees
  • The most monthly precipitation in Darien occurs in August with 7.7 inches
  • The air quality index in Darien is 11% worse than the national average
  • The pollution index in Darien is 196% worse than the national average

Compare Darien, IL Weather

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      Darien 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
      January17°F32°F24°F3.1"
      February18°F34°F26°F3.0"
      March31°F49°F39°F5.2"
      April40°F62°F50°F4.8"
      May51°F73°F61°F5.9"
      June60°F82°F70°F6.7"
      July64°F84°F73°F4.1"
      August62°F82°F71°F7.7"
      September55°F76°F65°F3.2"
      October44°F64°F53°F7.3"
      November33°F50°F41°F3.9"
      December22°F36°F29°F3.7"

      Darien 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.
      IndexDarienIllinoisNational
      Air quality index554150
      Pollution index14,981,3003,347,2955,066,862

      Darien air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality121
      Days with moderate air quality227
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality1

      Darien air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.140%
      Carbon Tetrachloride0.030%
      Lead0.020%
      Mercury0.010%

      Average monthly Darien temperature with heat index

      Darien monthly precipitation with daily maximum

      Darien monthly snow depth with daily maximum

      Darien monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Forest Park, IL14,1375510%
      Country Club Hills, IL16,7945510%
      Crestwood, IL10,9895510%
      Oak Forest, IL28,0555510%
      Evergreen Park, IL19,8495510%
      Darien, IL22,2325510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      New Brighton, MN22,233468%
      Farmington, MN22,226468%
      Bloomingdale, IL22,2215510%
      Silver Firs, WA22,2214510%
      Fresno, TX22,244524%
      Darien, IL22,2325510%
      Source: The Darien, 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.