February in Spearfish is the snowiest and the cloudiest month of the year. In February, the weather in Spearfish is typically freezing. Average daily high temperature in February is about 1 degree below zero. On average, Spearfish has 8 snowy, 7 partly cloudy, 6 sunny, 6 cloudy, and 2 rainy days in February. The snowfalls are usually light.