January in Klagenfurt is the coldest month of the year. In January, the weather in Klagenfurt is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Klagenfurt has 13 partly cloudy, 9 sunny, 5 cloudy, and 4 rainy days in January. The rains are usually light. January as well as February, March, November, and December is considered the most uncomfortable time to visit Klagenfurt.