TODAY AUG15
TEMPERATURE79
HUMIDITY84
PRESSURE29.88
WIND COND.180 8.1
  • 8569Thu20%40%
  • 8366Fri50%60%
  • 8466Sat20%
  • 8568Sun
  • 8365Mon60%60%
daynightWeather update from St. Louis Regional Airport at

Williamson 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
January23°F38°F29°F3.3"
February24°F40°F31°F3.5"
March36°F55°F44°F3.9"
April45°F67°F55°F9.3"
May55°F75°F64°F5.6"
June64°F84°F73°F7.9"
July66°F86°F76°F5.0"
August65°F86°F74°F5.1"
September57°F80°F67°F6.0"
October46°F68°F56°F5.6"
November36°F54°F44°F3.6"
December28°F42°F34°F3.6"

Did you know?

  • The highest monthly average temperature in Williamson for July is 76 degrees.
  • The lowest monthly average temperature in Williamson for January is 29 degrees.
  • The most monthly precipitation in Williamson occurs in April with 9.3 inches.
  • The air quality index in Williamson is 20% worse than the national average.
  • The pollution index in Williamson is 87% better than the national average.

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Compare Williamson, IL Weather To Other Cities

Williamson 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.
IndexWilliamsonIllinoisNational
Air quality index604150
Pollution index647,2803,347,2955,066,862

Williamson air quality information

MeasurementTotal
Days measured365
Days with good air quality99
Days with moderate air quality231
Days w/ poor A.Q. for sensitive groups33
Days with unhealthy air quality2

Williamson air quality information

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

Average monthly Williamson temperature with heat index

Williamson monthly precipitation with daily maximum

Williamson monthly snow depth with daily maximum

Williamson monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Butler, IL1543530%
Taylor Springs, IL4523530%
Litchfield, IL6,9763530%
Bunker Hill, IL1,7306020%
East Gillespie, IL2636020%
Williamson, IL2336020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Matthews, GA2334216%
Kelford, NC2333432%
Irwin, ID2334020%
Michigan City, ND2333530%
Dorrance, KS2333922%
Williamson, IL2336020%
Source: The Williamson, 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.