Will County Climate
Will County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.6°F
Annual Precip
40.9"
Annual Snowfall
27.0"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,242
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Will County
Climate Verdict
Will County has a mild, with an average annual temperature of 50.6°F, moderately wet with 40.9 inches of annual precipitation, rare extreme heat with only 15.350000000000001 days above 90°F annually, moderate snowfall of 27.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 23.9°F. summers are warm — July averages 74.3°F. Residents experience a substantial 50°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Will County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Will County closely matches the Illinois statewide average temperature of 52.8°F.
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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Track your own weather in Will County
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.