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