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