December in Pontarlier is the windiest month of the year. In December, the weather in Pontarlier is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Pontarlier has 21 rainy, 5 cloudy, 4 sunny, and 1 snowy day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Pontarlier.