Randolph County Climate
Randolph County, Illinois
Avg Annual Temp
55.8°F
Annual Precip
43.7"
Annual Snowfall
8.9"
Extreme Heat Days
46.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.