January in Clarksburg is the snowiest and the coldest month of the year. In January, the weather in Clarksburg is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Clarksburg has 14 rainy, 8 cloudy, 5 snowy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, April, and December is considered the most uncomfortable time to visit Clarksburg.