Jasper County Climate
Jasper County, Iowa
Avg Annual Temp
49.0°F
Annual Precip
35.9"
Annual Snowfall
28.7"
Extreme Heat Days
17.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jasper County Weather
Jasper's Classic Four-Season Profile
Jasper County averages 49.0°F, which is cooler than the national median but typical for the American heartland. This area experiences distinct seasonal transitions and moderate precipitation.
Matching the Iowa Baseline
The county tracks closely with state trends, averaging just one degree warmer than the 48.0°F Iowa norm. Its 35.9 inches of annual precipitation nearly mirrors the state average of 36.1 inches.
Consistency Across the Central Plains
Jasper is slightly cooler than Johnson County to the east, which averages 50.0°F. It records 18 extreme heat days per year, a moderate count compared to its southern neighbors.
Cold Winters and Breezy Summers
The county experiences 28.7 inches of snow annually, with winter averages dipping to 23.7°F. Summers are warm, peaking in July at 74.0°F with 18 days of heat reaching 90°F or higher.
Standard Gear for Central Iowa Living
Prepare for nearly 30 inches of snow with high-quality winter tires and shovels. The 18 days of extreme heat require a functional cooling system to maintain indoor comfort during July.
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.