Mahnomen County Climate
Mahnomen County, Minnesota
Avg Annual Temp
39.9°F
Annual Precip
26.4"
Annual Snowfall
—
Extreme Heat Days
5.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mahnomen County Weather
A True Northern Continental Climate
Mahnomen County sits at an average annual temperature of 39.9°F, significantly cooler than the national median of approximately 54°F. This reflects a humid continental climate characterized by profound seasonal shifts.
Cooler Than the Minnesota Average
The county's 39.9°F annual average trails the statewide mean of 42.8°F. It ranks among the chillier northern counties, receiving about 26.4 inches of precipitation annually compared to the state average of 30.0 inches.
Comparing North Country Climates
Mahnomen is slightly warmer than neighboring Marshall County to the north, which averages 39.3°F. However, it remains much colder than southern counties like Martin, which stays over six degrees warmer on average.
Deep Freezes and Mild Summers
January temperatures plummet to a 6.3°F average, while July remains comfortable at 68.1°F. Residents only face five days of extreme heat above 90°F each year.
Winter Resilience is Key
Homeowners should prioritize high-efficiency heating systems capable of handling extreme sub-zero January lows. While snowfall data is limited, the 10.4°F winter average demands heavy-duty insulation and thermal gear.
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.