Richland County Climate
Richland County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.2°F
Annual Precip
48.8"
Annual Snowfall
10.5"
Extreme Heat Days
32
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,829
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Richland County
Climate Verdict
Richland County has a mild, with an average annual temperature of 54.2°F, moderately wet with 48.8 inches of annual precipitation, occasional hot days — 31.8 per year above 90°F, light snow averaging 10.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.3°F. summers are warm — July averages 76.2°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Richland County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Richland County closely matches the Illinois statewide average temperature of 52.8°F, it is also noticeably wetter, receiving 7.0 inches more precipitation than the state average.
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 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.