TODAY JUN22
TEMPERATURE69
HUMIDITY100
PRESSURE29.7
WIND COND.
  • 7462Fri60%60%
  • 8063Sat
  • 8465Sun
  • 8567Mon
  • 8872Tue
daynightWeather update from Decatur Airport at

Illiopolis 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
January-8°F68°F31°Fn/a
February-6°F63°F29°Fn/a
March10°F79°F42°Fn/a
April23°F88°F54°Fn/a
May28°F91°F63°Fn/a
June48°F99°F74°Fn/a
July52°F100°F75°Fn/a
August50°F97°F74°Fn/a
September36°F91°F67°Fn/a
October27°F95°F55°Fn/a
November14°F73°F43°Fn/a
December0°F59°F31°Fn/a

Did you know?

  • The highest monthly average temperature in Illiopolis for July is 75 degrees.
  • The lowest monthly average temperature in Illiopolis for February is 29 degrees.
  • The most monthly precipitation in Illiopolis occurs in January with 0 inches.
  • The air quality index in Illiopolis is 21% better than the national average.
  • The pollution index in Illiopolis is 1% worse than the national average.

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Compare Illiopolis, IL Weather To Other Cities

Illiopolis 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.
IndexIlliopolisIllinoisNational
Air quality index394150
Pollution index5,136,0803,347,2955,066,862

Illiopolis air quality information

MeasurementTotal
Days measured365
Days with good air quality293
Days with moderate air quality72
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Illiopolis air quality information

PollutantTotal
Arsenic0.010%
Benzene0.090%
Carbon Tetrachloride0.010%
Lead0.390%
Mercury0.020%

Average monthly Illiopolis temperature with heat index

Illiopolis monthly precipitation with daily maximum

Illiopolis monthly snow depth with daily maximum

Illiopolis monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Cornland, IL703530%
Broadwell, IL1523530%
Dawson, IL5443530%
Buffalo, IL5033530%
Edinburg, IL1,1563530%
Illiopolis, IL8223922%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Wagener, SC8224216%
Ivy, VA8223334%
West Chazy, NY8223628%
Jefferson, WV8223432%
Rockvale, TN8223138%
Illiopolis, IL8223922%
Source: The Illiopolis, 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.