Linn County Climate
Linn County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.2°F
Annual Precip
37.1"
Annual Snowfall
30.8"
Extreme Heat Days
14
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,966
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Linn County
Climate Verdict
Linn County has a cool, averaging 48.2°F annually, moderate rainfall of 37.1 inches per year, rare extreme heat with only 13.566666666666665 days above 90°F annually, moderate snowfall of 30.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.5°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 Linn County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Linn County closely matches the Iowa statewide average temperature of 48.0°F.
Climate Profile
About Linn County Weather
Cooler than the national average
Linn County averages an annual temperature of 48.2°F, which is notably cooler than the national median. This humid continental climate features wide temperature swings between winter lows and summer highs.
Warmer than the Iowa average
At 48.2°F, Linn County sits just above the Iowa state average of 48.0°F. This makes it a mid-range county in terms of warmth compared to its 98 peers across the state.
A wetter climate than nearby neighbors
Linn receives 37.1 inches of annual precipitation, which is more than the state average of 36.1 inches. It experiences higher moisture levels than Marshall County to the west, which averages 35.9 inches.
Snowy winters and moderate heat
Winter temperatures average 22.9°F with 30.8 inches of annual snowfall. The summer months see 14 days where temperatures exceed 90°F, centering around a July average of 73.0°F.
Prepare for significant winter maintenance
Residents need high-capacity heating systems to manage January averages of 19.5°F. With over 30 inches of snow per year, reliable snow removal equipment is a household necessity.
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.