December in Poznan is the windiest month of the year. In December, the weather in Poznan is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Poznan has 14 cloudy, 13 rainy, 2 snowy, and 2 sunny days in December. The rains are usually light. December as well as January, February, March, and November is considered the most uncomfortable time to visit Poznan.