January in Osek is the snowiest, the cloudiest, and the most freezing month of the year. In January, the weather in Osek is typically freezing. Average daily high temperature in January is about zero. On average, Osek has 12 cloudy, 10 snowy, 6 rainy, and 3 sunny days in January. The snowfalls are usually light. January as well as February, March, April, and November is considered the most uncomfortable time to visit Osek.