Marshall County Climate
Marshall County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.7°F
Annual Precip
35.9"
Annual Snowfall
26.5"
Extreme Heat Days
13
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,908
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Marshall County
Climate Verdict
Marshall County has a cool, averaging 47.7°F annually, moderate rainfall of 35.9 inches per year, rare extreme heat with only 12.55 days above 90°F annually, moderate snowfall of 26.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.5°F. summers are warm — July averages 72.8°F. Residents experience a substantial 54°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Marshall County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Marshall County closely matches the Iowa statewide average temperature of 48.0°F.
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.
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.