DuPage County Climate
DuPage County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.3°F
Annual Precip
38.7"
Annual Snowfall
35.0"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,160
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: DuPage County
Climate Verdict
DuPage County has a mild, with an average annual temperature of 50.3°F, moderate rainfall of 38.7 inches per year, rare extreme heat with only 19.35 days above 90°F annually, moderate snowfall of 35.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.1°F. summers are warm — July averages 74.1°F. Residents experience a substantial 50°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for DuPage County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
DuPage County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About DuPage County Weather
Cooler and Drier than National Medians
DuPage County averages 50.3°F annually, making it cooler than the national median temperature. It receives 38.7 inches of precipitation and a significant 35.0 inches of snow.
Cooler Than the State Average
DuPage's 50.3°F annual average is lower than the Illinois state average of 52.8°F. This is characteristic of its location in the northern part of the state near Lake Michigan.
Consistent with the Chicago Suburbs
DuPage matches the snow-heavy profile of Cook and Will counties. Its 35 inches of annual snow is among the highest in the state, surpassing central Illinois by over a foot.
Cold Winters with Snowward Peaks
Winter temperatures average 27.1°F, fueling the heavy 35.0 inches of annual snowfall. July remains pleasant with an average of 74.1°F and 19 days of extreme heat.
Winterize for Heavy Snowfall
A heavy-duty snowblower is a must for the 35 inches of snow. Homeowners should also check attic insulation to manage the cold 24.1°F January average.
Frequently Asked Questions
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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.