January in Frankfurt am Main is the snowiest and the coldest month of the year. In January, the weather in Frankfurt am Main is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Frankfurt am Main has 9 rainy, 9 cloudy, 7 partly cloudy, 5 sunny, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, April, and October is considered the most uncomfortable time to visit Frankfurt am Main.