January weather forecast in Spearfish

January in Spearfish is the windiest month of the year. In January, the weather in Spearfish is typically freezing. Average daily high temperature in January is about 2 degrees below zero. On average, Spearfish has 12 partly cloudy, 8 sunny, 6 snowy, 4 cloudy, and 1 rainy day in January. The snowfalls are usually light.