Stanley County Climate
Stanley County, South Dakota
Avg Annual Temp
46.9°F
Annual Precip
18.3"
Annual Snowfall
31.3"
Extreme Heat Days
38.86666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Stanley County Weather
Dry and Temperate Plains Weather
At 46.9°F annually, Stanley County is cooler than the national median but warmer than much of the northern Midwest. Its dry climate is defined by just 18.3 inches of annual precipitation.
One of South Dakota's Warmer Spots
Stanley County exceeds the state average temperature of 45.6°F, making it a relatively warm enclave in the region. However, it is much drier than the state average of 22.7 inches.
Arid Conditions Compared to Eastern Peers
Stanley receives about 10 inches less rain per year than Yankton County to the southeast. This aridity creates a starkly different landscape than the wetter eastern edge of the state.
Significant Heat and Moderate Snowfall
Summers are intense with 39 days reaching over 90°F, driven by a July average of 74.8°F. Winter brings 31.3 inches of snow, which is lower than many of its central South Dakota neighbors.
Manage the Summer Heat Spike
Residents should prioritize powerful air conditioning systems to handle the frequent 90-degree days. Water-conscious landscaping is a necessity given the low 18.3-inch annual rainfall.
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.