December in Clermont-Ferrand is the windiest month of the year. In December, the weather in Clermont-Ferrand is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Clermont-Ferrand has 13 rainy, 8 cloudy, 6 sunny, and 4 partly cloudy days in December. The rains are usually moderate. December as well as January, February, April, and May is considered the most uncomfortable time to visit Clermont-Ferrand.