Jasper County Climate
Jasper County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.0°F
Annual Precip
35.9"
Annual Snowfall
28.7"
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,121
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jasper County
Climate Verdict
Jasper County has a cool, averaging 49.0°F annually, moderate rainfall of 35.9 inches per year, rare extreme heat with only 17.55 days above 90°F annually, moderate snowfall of 28.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.3°F. summers are warm — July averages 74.0°F. Residents experience a substantial 54°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Jasper County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jasper County closely matches the Iowa statewide average temperature of 48.0°F.
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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Track your own weather in Jasper County
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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.