December in Vanersborg is the windiest month of the year. In December, the weather in Vanersborg is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Vanersborg has 18 rainy, 8 cloudy, 3 sunny, 1 snowy, and 1 partly cloudy day in December. The rains are usually moderate. December as well as January, March, October, and November is considered the most uncomfortable time to visit Vanersborg.