Fall River County Climate
Fall River County, South Dakota
Avg Annual Temp
47.1°F
Annual Precip
17.8"
Annual Snowfall
38.6"
Extreme Heat Days
44.06
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Fall River County Weather
Hot, Dry, and Sun-Drenched
Fall River County averages 47.1°F annually, staying below the national median but ranking high for the region. Its semi-arid climate is characterized by low precipitation and hot summer afternoons.
A Heat Leader in South Dakota
The county is notably warmer than the 45.6°F state average. It ranks as one of the hottest spots in South Dakota during the peak of summer, driven by its southwestern location.
Significantly Drier than Neighbors
With only 17.8 inches of rain, this is one of the driest counties in the state compared to the 22.7-inch average. This dryness contributes to a staggering 44 days of heat above 90°F each year.
Intense Heat and Milder Winters
Summers are long and hot, though January is surprisingly mild for the state at 23.8°F. The 38.6 inches of snowfall is manageable due to the county's relatively warm winter average of 25.1°F.
Water Conservation is Key
Efficient air conditioning is a must for the 44 days of extreme summer heat. Gardeners should focus on xeriscaping to account for the low 17.8 inches of annual rain and high evaporation rates.
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.