Custer County Climate
Custer County, South Dakota
Avg Annual Temp
45.2°F
Annual Precip
19.5"
Annual Snowfall
43.0"
Extreme Heat Days
13.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Custer County Weather
Temperate Mountain and Plains Blend
Custer County maintains an average temperature of 45.2°F, which is cool by national standards. The area is relatively dry, receiving 19.5 inches of annual precipitation.
Typical South Dakota Average Temperature
Custer's 45.2°F annual average is almost identical to the South Dakota state average of 45.6°F. However, its 19.5 inches of precipitation is lower than the state's 22.7-inch average.
Milder Winters Than Northern Neighbors
Custer shares a similar annual temperature with Butte County, but enjoys much warmer Januarys at 25.5°F. It is also significantly snowier, receiving 43 inches compared to Butte's 41.7 inches.
Heavy Snow and Mild Summers
Summer in Custer is pleasant with only 14 days of extreme heat and a July average of 69.2°F. Winter is the dominant season, bringing the highest snowfall on this list at 43 inches.
Equip for Serious Snow Management
The 43 inches of annual snow requires high-quality winter gear and reliable four-wheel drive. Because summer temperatures are mild, residents can often rely on natural ventilation instead of heavy air conditioning.
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.