Slope County Climate
Slope County, North Dakota
Avg Annual Temp
44.5°F
Annual Precip
16.0"
Annual Snowfall
39.1"
Extreme Heat Days
30.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Slope County Weather
A Mild but Dry Western Climate
Slope County averages 44.5°F annually, staying well below the national median while remaining warmer than much of the state. Its semi-arid environment receives only 16.0 inches of precipitation each year. This combination creates a rugged, high-plains atmosphere.
One of North Dakota's Warmest Spots
At 44.5°F, Slope County ranks significantly higher than the state average of 41.0°F. Its position in the southwest corner of North Dakota provides it with a thermal advantage over the colder northern and eastern counties. This relative warmth defines the local ranching environment.
Drier and Warmer than Neighbors
Compared to Stark County's 16.4 inches, Slope is slightly drier with 16.0 inches of annual precipitation. It experiences far more extreme heat than its neighbors, recording 31 days over 90°F. This makes it one of the most heat-prone areas in the immediate region.
Intense Heat and Moderate Snow
Summers are hot, featuring 31 days above 90°F and a July average of 71.1°F. Winters are more manageable than in the east, with a 20.7°F average and 39.1 inches of snow. January temperatures stay relatively mild for the state, averaging 17.8°F.
Plan for Heat and Aridity
Residents should prioritize cooling systems and water conservation given the 31 days of extreme heat and low 16-inch rainfall. Durable winter gear is still necessary for the 39.1 inches of snow. Ranchers and gardeners must account for the high July temperatures and limited moisture.
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.