January in Cologne is the coldest month of the year. In January, the weather in Cologne is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, Cologne has 14 rainy, 10 cloudy, 4 sunny, and 3 partly cloudy days in January. The rains are usually light. January as well as February, November, and December is considered the most uncomfortable time to visit Cologne.