December in Grodno is the windiest month of the year. In December, the weather in Grodno is typically cold. Average daily high temperature in December is about zero. On average, Grodno has 12 cloudy, 10 rainy, 8 snowy, and 1 sunny day in December. The rains are usually moderate. December as well as March, April, May, and October is considered the most uncomfortable time to visit Grodno.