December in La Rochelle is the windiest month of the year. In December, the weather in La Rochelle is typically cold. Average daily high temperature in December is about 9 degrees above zero. On average, La Rochelle has 14 rainy, 7 partly cloudy, 6 sunny, and 4 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit La Rochelle.