December in Visby is the rainiest and the windiest month of the year. In December, the weather in Visby is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Visby has 20 rainy, 8 cloudy, 2 sunny, and 1 partly cloudy day in December. The rains are usually moderate. December as well as January, February, and November is considered the most uncomfortable time to visit Visby.