December in Chester is the cloudiest month of the year. In December, the weather in Chester is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Chester has 18 rainy, 7 cloudy, 3 sunny, and 3 partly cloudy days in December. The rains are usually light. December as well as January, February, October, and November is considered the most uncomfortable time to visit Chester.