January in Jefferson City is the windiest and the coldest month of the year. In January, the weather in Jefferson City is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Jefferson City has 14 partly cloudy, 11 sunny, 3 rainy, and 3 cloudy days in January. The rains are usually moderate. January as well as February, March, April, and December is considered the most uncomfortable time to visit Jefferson City.