Madison County Climate
Madison County, Iowa
Avg Annual Temp
48.1°F
Annual Precip
34.8"
Annual Snowfall
30.7"
Extreme Heat Days
14.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.