January in Trowbridge is the windiest and the coldest month of the year. In January, the weather in Trowbridge is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Trowbridge has 17 rainy, 6 sunny, 5 cloudy, and 3 partly cloudy days in January. The rains are usually moderate. January as well as February, March, August, and November is considered the most uncomfortable time to visit Trowbridge.