January weather forecast in Sudbury

January in Sudbury is the coldest month of the year. In January, the weather in Sudbury is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Sudbury has 13 rainy, 12 cloudy, 4 sunny, and 2 partly cloudy days in January. The rains are usually moderate. January as well as February, July, November, and December is considered the most uncomfortable time to visit Sudbury.