January in Washington is the snowiest and the coldest month of the year. In January, the weather in Washington is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Washington has 12 cloudy, 7 sunny, 6 rainy, 3 snowy, and 3 partly cloudy days in January. The rains are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit Washington.