Fall River, SD County has a semi-arid climate with hot summers and cold winters. The average temperature in summer is around 80°F (27°C), while the average temperature in winter drops to around 32°F (0°C). Rainfall is usually sparse in the county, and snowfall is relatively low compared to other areas of South Dakota. Snow typically falls from late October through early April, although it can be unpredictable. As a result, Fall River experiences four distinct seasons with plenty of sunshine throughout the year.
Fall River County, South Dakota gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Fall River County averages 35 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 226 sunny days per year in Fall River County. The US average is 205 sunny days.
Fall River County gets some kind of precipitation, on average, 74 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 90 degrees
Winter Low: the January low is 12
Rain: averages 18 inches of rain a year
Snow: averages 35 inches of snow a year