January in Susanville is the snowiest month of the year. In January, the weather in Susanville is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Susanville has 9 partly cloudy, 8 sunny, 8 cloudy, 4 rainy, and 2 snowy days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Susanville.