January in Bismarck is the most freezing month of the year. In January, the weather in Bismarck is typically freezing. Average daily high temperature in January is about 6 degrees below zero. On average, Bismarck has 15 cloudy, 9 partly cloudy, 5 sunny, and 2 snowy days in January. The snowfalls are usually light. January as well as March, April, November, and December is considered the most uncomfortable time to visit Bismarck.