Shelby County Climate
Shelby County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.3°F
Annual Precip
41.3"
Annual Snowfall
13.7"
Extreme Heat Days
30
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,691
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Shelby County
Climate Verdict
Shelby County has a mild, with an average annual temperature of 53.3°F, moderately wet with 41.3 inches of annual precipitation, occasional hot days — 30.133333333333336 per year above 90°F, light snow averaging 13.7 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.5°F. summers are warm — July averages 75.7°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Shelby County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Shelby County closely matches the Illinois statewide average temperature of 52.8°F.
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 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.