Mercer County Climate
Mercer County, North Dakota
Avg Annual Temp
43.2°F
Annual Precip
17.3"
Annual Snowfall
33.4"
Extreme Heat Days
28.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mercer County Weather
Northern Interior Climate Patterns
Mercer County averages 43.2°F annually, which is significantly colder than the U.S. national average. It is characterized by high summer temperatures and very cold winters.
A Warm Spot in North Dakota
Mercer is one of the warmest counties in the state, with its 43.2°F average sitting well above the 41.0°F state benchmark. It is also drier than most, seeing just 17.3 inches of rain.
Unusually High Summer Heat Days
Mercer experiences 29 days of extreme heat, significantly more than neighboring McLean's 13 days. It is one of the most heat-prone areas in the regional vicinity.
Hot Summers and Less Snow
July averages 70.6°F, which is warm for the state. While winters are cold at a 16.3°F average, the annual snowfall of 33.4 inches is lower than many neighboring counties.
Manage Summer Heat and Winter Cold
Residents need high-capacity cooling systems to handle nearly a month of 90°F days. Winter prep remains important, though snow removal is less intensive than in Mountrail.
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.