Marshall County Climate
Marshall County, Iowa
Avg Annual Temp
47.7°F
Annual Precip
35.9"
Annual Snowfall
26.5"
Extreme Heat Days
12.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marshall County Weather
Cooler and temperate year-round
Marshall County's 47.7°F average temperature is cooler than the national median. Its position in central Iowa results in a classic continental climate with no dry season.
Slightly cooler than the state
Marshall County sits just below the Iowa average temperature of 48.0°F. Its annual precipitation of 35.9 inches also falls just shy of the state average of 36.1 inches.
Fewer extreme heat days
With only 13 days above 90°F, Marshall is milder in the summer than neighbors like Linn or Marion. It is also drier than Linn County, receiving about 1.2 inches less rain each year.
Predictable snow and mild summers
The county receives 26.5 inches of snow annually, paired with a 22.0°F winter average. Summer is moderate, with a July average of 72.8°F and relatively few extreme heat days.
Stable climate with winter needs
The 26.5 inches of snow requires standard removal equipment, though it is less than some eastern neighbors. Efficient heating is necessary for the January average of 18.5°F.
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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.