December in Cambridge is the windiest month of the year. In December, the weather in Cambridge is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Cambridge has 14 rainy, 10 cloudy, 4 sunny, and 3 partly cloudy days in December. The rains are usually moderate. December as well as January, February, April, and June is considered the most uncomfortable time to visit Cambridge.