January in Falmouth is the snowiest and the coldest month of the year. In January, the weather in Falmouth is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Falmouth has 11 sunny, 9 partly cloudy, 8 rainy, 2 cloudy, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, and December is considered the most uncomfortable time to visit Falmouth.