Madison County Climate
Madison County, Illinois
Avg Annual Temp
55.7°F
Annual Precip
44.1"
Annual Snowfall
10.5"
Extreme Heat Days
29.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Madison County Weather
Warm Regional Climate Center
Madison County features a 55.7°F annual average temperature, placing it among the warmer counties in the Midwest. Its 44.1 inches of rainfall are well above the national median for inland counties.
Exceeding State Temperature Norms
At 55.7°F, Madison County is significantly warmer than the Illinois statewide average of 52.8°F. Its July average of 78.3°F makes it one of the hottest regions in the state.
Low Snowfall Compared to Peers
Madison averages only 10.5 inches of snow, which is much lower than the 20+ inches seen in central Illinois. It shares a high precipitation profile with southern neighbor Marion, both exceeding 44 inches of rain.
Intense Summer Heat Peaks
July is very hot here, averaging 78.3°F with 29 days of extreme heat above 90°F. Conversely, winter is the mildest of this group, with a December-February average of 33.4°F.
Investment in Summer Comfort
With nearly 30 days of extreme heat, powerful air conditioning is a primary requirement for residents. Minimal snow gear is needed, but high-quality rain protection is vital for the 44.1 inches of annual precipitation.
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.