Shelby County Climate
Shelby County, Iowa
Avg Annual Temp
49.5°F
Annual Precip
34.3"
Annual Snowfall
30.5"
Extreme Heat Days
18.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Shelby County Weather
Shelby County Sees Frequent Thermal Swings
The annual average temperature of 49.5°F reflects a classic continental climate with distinct, often harsh, seasonal changes. This average sits below the national median but remains typical for the American heartland.
Warmer Than the Iowa State Average
Shelby County's average temperature of 49.5°F is 1.5 degrees warmer than the statewide average of 48.0°F. This makes it one of the more temperate options within the state's borders.
Lighter Rainfall Than Eastern Iowa
The county records 34.3 inches of annual precipitation, trailing the state average of 36.1 inches. This slightly drier profile is common for counties situated in the western third of the state.
Snowy Winters and Significant Summer Heat
Residents experience 19 days of extreme heat over 90°F during summers that average 72.9°F. Winters bring an average of 30.5 inches of snow and January lows that hover around 20.5°F.
Dual Focus on Heat and Snow
Homeowners must prepare for nearly three weeks of 90°F heat while maintaining snow blowers for over 30 inches of winter accumulation. The 54-degree swing between January and July averages requires robust home insulation.
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.