Shelby County Climate
Shelby County, Illinois
Avg Annual Temp
53.3°F
Annual Precip
41.3"
Annual Snowfall
13.7"
Extreme Heat Days
30.133333333333336
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Shelby County Weather
Stepping Above National Norms
Shelby County’s annual average temperature of 53.3°F sits higher than the national median of 52.7°F. The climate is defined by reliable precipitation and warm summer peaks.
Aligned with Central Illinois Trends
The county is slightly warmer than the state average of 52.8°F. It receives 41.3 inches of annual precipitation, which is nearly identical to the Illinois average.
Warmer and Drier than the West
Shelby averages 53.3°F, making it warmer than Schuyler County's 51.7°F. However, it sees less snowfall than northern neighbors, recording 13.7 inches annually.
Moderate Snow and High Heat
The county experiences 30 days of extreme heat each year, mostly concentrated in a July that averages 75.7°F. Winters are relatively mild for Illinois, with 13.7 inches of total snow.
Prepare for Humid Summers
With 30 days of heat above 90°F, adequate ventilation and cooling are essential for comfort. The modest 13.7-inch snowfall means lighter winter equipment is usually sufficient.
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.