January in Karlovy Vary is the snowiest and the most freezing month of the year. In January, the weather in Karlovy Vary is typically freezing. Average daily high temperature in January is about zero. On average, Karlovy Vary has 12 cloudy, 7 partly cloudy, 5 snowy, 4 sunny, and 3 rainy days in January. The snowfalls are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Karlovy Vary.