January in Starý Plzenec is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Starý Plzenec is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Starý Plzenec has 14 cloudy, 7 partly cloudy, 5 rainy, 3 sunny, and 2 snowy days in January. The rains are usually light. January as well as February, March, April, and May is considered the most uncomfortable time to visit Starý Plzenec.