Cass County Climate
Cass County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.3°F
Annual Precip
36.8"
Annual Snowfall
27.3"
Extreme Heat Days
22
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,215
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Cass County
Climate Verdict
Cass County has a cool, averaging 49.3°F annually, moderate rainfall of 36.8 inches per year, occasional hot days — 22.4 per year above 90°F, moderate snowfall of 27.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.6°F. summers are warm — July averages 74.8°F. Residents experience a substantial 54°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Cass County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Cass County closely matches the Iowa statewide average temperature of 48.0°F.
Climate Profile
About Cass County Weather
Closing the Gap on National Medians
Cass County averages 49.3°F annually, the warmest in this regional group and only 3.7 degrees below the national median. This southern-shifted location brings more intense summer heat to the local landscape.
Warmest of the Selected Counties
Averaging 1.3 degrees above the Iowa state mean of 48.0°F, Cass County represents the warmer side of the state. It also sees 36.8 inches of precipitation, slightly exceeding the state average.
More Heat than Northern Peers
Cass is significantly warmer than Carroll (48.3°F) and Calhoun (47.2°F). It receives less snow than northern counties, averaging 27.3 inches per year.
Significant Summer Highs
July averages 74.8°F, but the standout figure is the 22 days per year where temperatures exceed 90°F. Winters are the mildest in this set, with a January average of 20.6°F.
Prioritize Cooling and Hydration
The 22 days of extreme heat require residents to have reliable air conditioning and heat-safety plans. Lower snowfall of 27.3 inches makes winter travel easier here than in Iowa's northern counties.
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.