Douglas County Climate
Douglas County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.4°F
Annual Precip
39.9"
Annual Snowfall
17.5"
Extreme Heat Days
27
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,578
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Douglas County
Climate Verdict
Douglas County has a mild, with an average annual temperature of 52.4°F, moderate rainfall of 39.9 inches per year, occasional hot days — 26.7 per year above 90°F, light snow averaging 17.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.0°F. summers are warm — July averages 75.1°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Douglas County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Douglas County closely matches the Illinois statewide average temperature of 52.8°F.
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
What is the average temperature in Douglas County?
How much rain does Douglas County get?
Does it snow in Douglas County?
How hot does Douglas County get in summer?
How cold are winters in Douglas County?
Track your own weather in Douglas County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.