In December, the weather in Aix-les-Bains is typically cold. Average daily high temperature in December is about 5 degrees above zero. On average, Aix-les-Bains has 11 rainy, 9 partly cloudy, 5 sunny, 5 cloudy, 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 Aix-les-Bains.