December in Metz is the windiest month of the year. In December, the weather in Metz is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Metz has 18 rainy, 10 cloudy, and 3 sunny days in December. The rains are usually moderate. December as well as January, February, May, and November is considered the most uncomfortable time to visit Metz.