Mountrail County Climate
Mountrail County, North Dakota
Avg Annual Temp
38.7°F
Annual Precip
18.0"
Annual Snowfall
48.5"
Extreme Heat Days
10.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mountrail County Weather
Among the Nation's Coldest Counties
Mountrail County's 38.7°F average annual temperature is among the lowest in the continental U.S. This sub-40-degree average creates a truly northern climate profile.
Significantly Colder than State Average
The county is much colder than the 41.0°F North Dakota average. It also experiences 48.5 inches of snow, which is higher than many other parts of the state.
A Regional Snow Leader
Mountrail's 48.5 inches of snow far exceeds Mercer's 33.4 inches. It also sees only 10 extreme heat days, making it much cooler than neighboring McKenzie.
Brutal Winters and Mild Summers
Winters are long and cold, with a January average of just 8.4°F. Summers remain pleasant and mild, with a July average of 66.8°F and very few days over 90°F.
Invest in Heavy Winter Gear
A high-powered snow blower is essential for the nearly 50 inches of annual snow. High-performance home heating is a must to combat the 11.4°F winter average.
Frequently Asked Questions
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Track your own weather in Mountrail County
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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.