TODAY DEC15
TEMPERATURE27
HUMIDITY99
PRESSURE30.19
WIND COND.10 3.4
  • 4325Sat
  • 4325Sun
  • 3522Mon
  • 3927Tue
  • 4234Wed
daynightWeather update from De Kalb Taylor Municipal Airport at

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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"

Did you know?

  • The highest monthly average temperature in Cortland for July is 72 degrees.
  • The lowest monthly average temperature in Cortland for January is 23 degrees.
  • The most monthly precipitation in Cortland occurs in August with 5.9 inches.
  • The air quality index in Cortland is 37% better than the national average.
  • The pollution index in Cortland is 63% better than the national average.

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Compare Cortland, IL Weather To Other Cities

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 index314150
Pollution index1,874,4903,347,2955,066,862

Cortland air quality information

MeasurementTotal
Days measured365
Days with good air quality339
Days with moderate air quality26
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Cortland air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Shabbona, IL982198%
Waterman, IL1,527198%
Sugar Grove, IL9,288198%
Big Rock, IL1,139198%
Hinckley, IL2,053198%
Cortland, IL4,1353138%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Wolfforth, TX4,1352648%
Grant, MN4,1344412%
Eldorado, IL4,1343922%
Wayland, MI4,1343922%
Gatlinburg, TN4,1384118%
Cortland, IL4,1353138%
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.