January in Vianden is the snowiest and the coldest month of the year. In January, the weather in Vianden is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Vianden has 11 cloudy, 10 rainy, 5 partly cloudy, 4 sunny, and 1 snowy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Vianden.