Warren County Climate
Warren County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.3°F
Annual Precip
39.2"
Annual Snowfall
25.6"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,257
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Warren County
Climate Verdict
Warren County has a mild, with an average annual temperature of 50.3°F, moderate rainfall of 39.2 inches per year, rare extreme heat with only 18.55 days above 90°F annually, moderate snowfall of 25.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.6°F. summers are warm — July averages 73.8°F. Residents experience a substantial 51°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Warren County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Warren County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat drier than average for Illinois.
Climate Profile
About Warren County Weather
Cooler than the national average
Warren County averages 50.3°F annually, which is cooler than the national median temperature. It sees 39.2 inches of precipitation, slightly lower than the typical Illinois baseline.
Below the Illinois temperature average
The county's 50.3°F average sits 2.5 degrees below the state average of 52.8°F. This puts Warren in the colder half of the state, reflective of its west-central location.
Snowier than its southern peers
Warren County receives 25.6 inches of snow, more than double the amount seen in southern counties like Wayne. It shares a similar climate profile with northern neighbor Whiteside County, though it is slightly warmer.
Significant snowfall and crisp winters
Winters are cold with a January average of 22.6°F and over two feet of total annual snow. Summers are pleasant but brief, featuring only 19 days of extreme heat above 90°F.
Winterize for snow and cold
Heavier winter gear and snow removal equipment are essential for the 25.6 inches of annual snowfall. Residents should also ensure home insulation is sufficient for January temperatures that regularly dip into the low 20s.
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.