In December, the weather in Clermont-Ferrand is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Clermont-Ferrand has 12 rainy, 9 partly cloudy, 6 cloudy, and 4 sunny days in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Clermont-Ferrand.