DuPage County Climate
DuPage County, Illinois
Avg Annual Temp
50.3°F
Annual Precip
38.7"
Annual Snowfall
35.0"
Extreme Heat Days
19.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.