December in Derby is the windiest month of the year. In December, the weather in Derby is typically cold. Average daily high temperature in December is about 6 degrees above zero. On average, Derby has 14 rainy, 7 cloudy, 6 partly cloudy, and 4 sunny days in December. The rains are usually moderate. December as well as January, February, March, and June is considered the most uncomfortable time to visit Derby.