December in Plzeň is the windiest month of the year. In December, the weather in Plzeň is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Plzeň has 17 cloudy, 9 rainy, 3 sunny, 1 snowy, and 1 partly cloudy day in December. The rains are usually light. December as well as January, February, and May is considered the most uncomfortable time to visit Plzeň.