January in Bangor is the windiest and the cloudiest month of the year. In January, the weather in Bangor is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Bangor has 20 rainy, 7 cloudy, 3 sunny, and 1 partly cloudy day in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Bangor.