Madison County Climate
Madison County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.1°F
Annual Precip
34.8"
Annual Snowfall
30.7"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
2,919
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Madison County
Climate Verdict
Madison County has a cool, averaging 48.1°F annually, moderate rainfall of 34.8 inches per year, rare extreme heat with only 14.7 days above 90°F annually, moderate snowfall of 30.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.9°F. summers are warm — July averages 73.0°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Madison County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Madison County closely matches the Iowa statewide average temperature of 48.0°F.
Climate Profile
About Madison County Weather
Standard Midwestern temperature profile
Madison County averages 48.1°F annually, sitting below the national median for U.S. counties. The climate is defined by four distinct seasons with significant variation in monthly averages.
Typical Iowa weather patterns
Madison County's annual average of 48.1°F is almost identical to the state average of 48.0°F. Its precipitation of 34.8 inches is slightly lower than the state benchmark of 36.1 inches.
Drier than eastern neighbors
Madison is drier than neighboring Linn and Mahaska counties, receiving about 2 to 4 fewer inches of rain per year. It shares a similar temperature profile with Linn County, differing by only 0.1 degrees.
Cold winters and steady heat
The county experiences 30.7 inches of snow and a January average of 19.9°F. Summer heat peaks with 15 days above 90°F, contributing to a July average of 73.0°F.
Balanced seasonal preparation needed
Reliable heating is necessary for the 23.1°F winter average. Residents should also prepare for two weeks of extreme summer heat where temperatures regularly cross the 90°F threshold.
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.