January in Haltern am See is the snowiest and the coldest month of the year. In January, the weather in Haltern am See is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Haltern am See has 12 rainy, 9 cloudy, 6 partly cloudy, 3 sunny, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, October, and November is considered the most uncomfortable time to visit Haltern am See.