Warren County Climate
Warren County, Illinois
Avg Annual Temp
50.3°F
Annual Precip
39.2"
Annual Snowfall
25.6"
Extreme Heat Days
18.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.