Richland County Climate
Richland County, Illinois
Avg Annual Temp
54.2°F
Annual Precip
48.8"
Annual Snowfall
10.5"
Extreme Heat Days
31.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Richland County Weather
Balanced Midwestern Weather
Richland County's average annual temperature of 54.2°F sits just above the national median. It features the typical four-season cycle common to the humid continental climate of the interior United States.
Warmer Temperatures and High Rainfall
At 54.2°F, the county is warmer than the 52.8°F Illinois state average. It also receives 48.8 inches of annual precipitation, which is significantly higher than the state average of 41.7 inches.
Wet and Warm Regional Profile
Richland experiences more precipitation than nearby Randolph County. Its 32 days of extreme heat and 10.5 inches of snow place it squarely in the middle of regional climate trends.
Moist Summers and Snowy Dustings
The county sees 32 days above 90°F during the warm summer months. Winters bring a manageable 10.5 inches of snow, with January temperatures averaging a brisk 29.3°F.
Drainage and Moisture Control
Given the high precipitation of nearly 49 inches, homeowners should ensure proper attic ventilation and sump pump reliability. All-season tires are usually sufficient for the 10.5 inches of annual snow.
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.