December in Geneva is the windiest month of the year. In December, the weather in Geneva is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Geneva has 18 rainy, 7 sunny, 4 partly cloudy, and 2 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Geneva.