January in Brattleboro is the snowiest and the most freezing month of the year. In January, the weather in Brattleboro is typically freezing. Average daily high temperature in January is about 1 degree below zero. On average, Brattleboro has 9 sunny, 8 partly cloudy, 6 snowy, 6 cloudy, and 2 rainy days in January. The snowfalls are usually heavy.