Perry County Climate
Perry County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.0°F
Annual Precip
47.2"
Annual Snowfall
10.3"
Extreme Heat Days
38
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,113
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Perry County
Climate Verdict
Perry County has a mild, with an average annual temperature of 56.0°F, moderately wet with 47.2 inches of annual precipitation, occasional hot days — 37.8 per year above 90°F, light snow averaging 10.3 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.1°F. summers are warm — July averages 77.4°F. The 45°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
Perry County is 3.2°F warmer than the Illinois statewide average of 52.8°F, it is also noticeably wetter, receiving 5.4 inches more precipitation than the state average.
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 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.