Linn County Climate
Linn County, Iowa
Avg Annual Temp
48.2°F
Annual Precip
37.1"
Annual Snowfall
30.8"
Extreme Heat Days
13.566666666666665
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.