TODAY AUG16
TEMPERATURE82
HUMIDITY72
PRESSURE29.96
WIND COND.200 6.9
  • 8267Fri50%40%
  • 8365Sat
  • 8368Sun
  • 8266Mon
  • 7859Tue
daynightWeather update from Mattoon / Charleston, Coles County Memorial Airport at

Casey Average Weather

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
January21°F37°F28°F1.5"
February22°F39°F30°F1.7"
March35°F54°F44°F2.1"
April45°F66°F55°F4.9"
May55°F75°F64°F3.8"
June64°F84°F74°F4.7"
July66°F86°F75°F4.2"
August64°F85°F74°F2.1"
September57°F79°F67°F3.0"
October46°F67°F56°F2.9"
November35°F53°F44°F2.4"
December27°F41°F33°F2.4"

Did you know?

  • The highest monthly average temperature in Casey for July is 75 degrees.
  • The lowest monthly average temperature in Casey for January is 28 degrees.
  • The most monthly precipitation in Casey occurs in April with 4.9 inches.
  • The air quality index in Casey is 25% better than the national average.
  • The pollution index in Casey is 88% better than the national average.

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Compare Casey, IL Weather To Other Cities

Casey 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.
IndexCaseyIllinoisNational
Air quality index374150
Pollution index583,0293,347,2955,066,862

Casey air quality information

MeasurementTotal
Days measured214
Days with good air quality201
Days with moderate air quality13
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Casey air quality information

PollutantTotal
Arsenic0.001%
Benzene0.020%
Carbon Tetrachloride0.000%
Lead0.001%
Mercury0.001%

Average monthly Casey temperature with heat index

Casey monthly precipitation with daily maximum

Casey monthly snow depth with daily maximum

Casey monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Hidalgo, IL1053726%
Toledo, IL1,3723726%
Jewett, IL2263726%
Charleston, IL21,2573726%
Yale, IL1293726%
Casey, IL2,5613726%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Green Acres, CA2,5608570%
Wales, WI2,5624510%
Belle Plaine, IA2,5624216%
The Hills, TX2,5624118%
Overton, TX2,5603530%
Casey, IL2,5613726%
Source: The Casey, 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.