Will County Climate
Will County, Illinois
Avg Annual Temp
50.6°F
Annual Precip
40.9"
Annual Snowfall
27.0"
Extreme Heat Days
15.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Will County Weather
Cooler than the national median
Will County's annual average temperature of 50.6°F reflects its position in the upper Midwest. It receives 40.9 inches of precipitation, which is standard for the Great Lakes region.
A typical northern Illinois climate
The county's 50.6°F average is lower than the statewide average of 52.8°F. It belongs to the cooler northern tier of Illinois where winter weather is more persistent.
Slightly warmer than its neighbors
Will County is slightly warmer than Whiteside County's 49.1°F but significantly cooler than southern Vermilion. It averages 27 inches of snow, which is less than its western neighbors.
Cold winters with moderate snow
January temperatures average 23.9°F, accompanied by 27 inches of total annual snowfall. Summers are mild, with only 15 days of extreme heat above 90°F.
Equip for the long winter
Dependable heating and snow tires are important for the four months of freezing temperatures and snow. Residents can expect fewer extreme heat days, making standard air conditioning sufficient.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.