Douglas County Climate
Douglas County, Illinois
Avg Annual Temp
52.4°F
Annual Precip
39.9"
Annual Snowfall
17.5"
Extreme Heat Days
26.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Douglas County Weather
Moderate Temperatures with Significant Heat
Douglas County averages 52.4°F annually, which is very close to the national median temperature. However, it experiences 27 extreme heat days per year, indicating a volatile summer season.
Aligning with the Illinois State Average
The county's average temperature of 52.4°F nearly matches the state average of 52.8°F. Its precipitation of 39.9 inches is slightly below the state norm of 41.7 inches.
A Typical Central Illinois Profile
Douglas County shares the flat, exposed landscape and weather of its neighbors in the heart of the state. It sees more heat days than northern counties but less snow than the Chicago region.
Hot Summers and Balanced Winters
Summer averages reach 73.7°F with 27 days topping 90°F. Winter remains manageable with 17.5 inches of snow and a January average of 26.0°F.
Manage the Summer Heat Swings
Air conditioning is a priority given the nearly four weeks of extreme heat each year. Residents should also keep winter gear ready for the 17.5 inches of annual snowfall.
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.