Roseau County Climate
Roseau County, Minnesota
Avg Annual Temp
36.6°F
Annual Precip
27.7"
Annual Snowfall
—
Extreme Heat Days
2.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Roseau County Weather
Subarctic Chills on the Northern Border
Roseau County is one of the coldest spots in the lower 48 with an average annual temperature of only 36.6°F. This is nearly 17 degrees colder than the national median, placing it firmly in a continental subarctic climate zone.
Far Below the State Average
The county's average of 36.6°F is significantly lower than the Minnesota state average of 42.8°F. It consistently ranks as one of the coldest counties in the state due to its position on the Canadian border.
Cold Even by Northern Standards
Compared to Kittson County to the west, Roseau maintains a similarly frigid profile with just 27.7 inches of annual precipitation. It lacks the lake-effect moderation found further east, leading to more stable but extreme cold.
Brutal Winters and Mild Summers
Winter averages are a punishing 6.6°F, while summers remain mild with a July average of 65.8°F. The county only sees about 2 days per year where temperatures reach or exceed 90°F.
Winter Survival and Heating Focus
High-efficiency heating systems and heavy-duty insulation are non-negotiable for the 6.6°F winter average. Residents rarely need intensive air conditioning given the rare occurrence of extreme heat days.
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.