January in Derby is the coldest month of the year. In January, the weather in Derby is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Derby has 14 rainy, 9 cloudy, 5 sunny, and 3 partly cloudy days in January. The rains are usually moderate. January as well as February, March, June, and July is considered the most uncomfortable time to visit Derby.