Mercer County Climate
Mercer County, North Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.2°F
Annual Precip
17.3"
Annual Snowfall
33.4"
Extreme Heat Days
29
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4a
Minimum winter temperature range for plant survival
2,338
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mercer County
Climate Verdict
Mercer County has a cool, averaging 43.2°F annually, semi-arid conditions with only 17.3 inches of annual precipitation, occasional hot days — 28.6 per year above 90°F, moderate snowfall of 33.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 13.0°F. summers are warm — July averages 70.6°F. Residents experience a substantial 58°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Mercer County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Mercer County closely matches the North Dakota statewide average temperature of 40.9°F, it is somewhat drier than average for North Dakota, the county experiences 15.709567307692307 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.