Perry County Climate
Perry County, Illinois
Avg Annual Temp
56.0°F
Annual Precip
47.2"
Annual Snowfall
10.3"
Extreme Heat Days
37.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Perry County Weather
A Warm and Wet Southern Profile
Perry County is warmer and wetter than most of the country, with a 56.0°F annual average and 47.2 inches of rain. This climate supports dense vegetation and long, humid summers.
Hotter and Wetter Than Illinois Norms
At 56.0°F, Perry is 3.2 degrees warmer than the Illinois state average. It also receives 5.5 inches more precipitation than the average Illinois county.
Much Rainier Than Central Neighbors
Perry receives 47.2 inches of rain, dwarfing the 38.1 inches seen in Peoria County. It also sees 15 more extreme heat days than its neighbors to the north.
Long Summers and Short Winters
July averages 77.4°F with 38 days of extreme heat annually. Winters are mild, averaging 35.0°F with just 10.3 inches of snow, allowing for more outdoor activity year-round.
Prioritize Humidity and Flood Control
With 47.2 inches of rain, sump pumps and dehumidifiers are essential for every home. High-capacity cooling is a must for the 38 days of heat exceeding 90°F.
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.