TODAY NOV25
TEMPERATURE46
HUMIDITY92
PRESSURE100810
WIND COND.
  • 4824Mon20%
  • 3728Tue
  • 4125Wed20%30%
  • 3419
  • 2714Fri
daynightWeather update from De Kalb Taylor Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Cortland for July is 72.2 degrees
  • The lowest monthly average temperature in Cortland for January is 22.8 degrees
  • The most monthly precipitation in Cortland occurs in August with 5.9 inches
  • The air quality index in Cortland is equal to the national average
  • The pollution index in Cortland is 31% better than the national average

Compare Cortland, IL Weather

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      Cortland 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°F31°F23°F2.8"
      February17°F32°F24°F2.8"
      March30°F47°F37°F4.6"
      April39°F61°F49°F5.8"
      May50°F72°F60°F5.3"
      June59°F80°F69°F5.6"
      July63°F82°F72°F5.8"
      August61°F81°F70°F5.9"
      September54°F75°F63°F3.7"
      October43°F63°F52°F5.8"
      November32°F49°F39°F4.0"
      December21°F34°F27°F3.1"

      Cortland 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.
      IndexCortlandIllinoisNational
      Air quality index424142
      Pollution index1,874,4903,148,6942,726,193

      Cortland air quality

      MeasurementTotal
      Days measured341
      Days with good air quality240
      Days with moderate air quality100
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.002%
      Benzene0.030%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.010%

      Average monthly Cortland temperature with heat index

      Cortland monthly precipitation with daily maximum

      Cortland monthly snow depth with daily maximum

      Cortland monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Kaneville, IL5180100.0%
      Big Rock, IL1,2710100.0%
      Waterman, IL1,7380100.0%
      Hinckley, IL2,1900100.0%
      Prestbury, IL1,9780100.0%
      Cortland, IL4,2614216.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Highlands-Baywood Park, CA4,2614314.0%
      Centralia, MO4,2603824.0%
      Medina, TN4,2602746.0%
      Morgan, UT4,2594510.0%
      Lyons, GA4,2632648.0%
      Cortland, IL4,2614216.0%
      Source: The Cortland, 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.