January in Kastellaun is the coldest month of the year. In January, the weather in Kastellaun is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Kastellaun has 14 rainy, 14 cloudy, and 3 sunny days in January. The rains are usually light. January as well as February, November, and December is considered the most uncomfortable time to visit Kastellaun.