Randolph County Climate
Randolph County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.8°F
Annual Precip
43.7"
Annual Snowfall
8.9"
Extreme Heat Days
46
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,087
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Randolph County
Climate Verdict
Randolph County has a mild, with an average annual temperature of 55.8°F, moderately wet with 43.7 inches of annual precipitation, occasional hot days — 46.35 per year above 90°F, light snow averaging 8.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 31.6°F. summers are warm — July averages 77.7°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Randolph County closely matches the Illinois statewide average temperature of 52.8°F, the county experiences 19.088967803030304 more extreme heat days than the state average.
Climate Profile
About Randolph County Weather
A Mild and Humid Climate
Randolph County averages 55.8°F annually, placing it above the national median for temperature. This temperate climate experiences distinct seasonal shifts but remains warmer than the national average year-round.
Warmer and Drier Than Average
The county's 55.8°F average exceeds the state average of 52.8°F. Precipitation totals 43.7 inches annually, slightly more than the Illinois average of 41.7 inches.
Southern Central Regional Comparison
Randolph is warmer than Richland County and experiences 46 days of extreme heat. This is significantly higher than northern Illinois counties, marking it as a warmer regional hub.
Long Summers and Moderate Winters
Summers are intense with 46 days above 90°F and a July average of 77.7°F. Winters are relatively short, with only 8.9 inches of annual snowfall and a January average of 31.6°F.
Manage the Summer Heat Spike
With over 45 days of extreme heat, reliable air conditioning and cooling centers are essential. Winter preparation is simple, as less than 9 inches of snow falls in a typical year.
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.