January in Sturgeon Bay is the snowiest and the most freezing month of the year. In January, the weather in Sturgeon Bay is typically freezing. Average daily high temperature in January is about 3 degrees below zero. On average, Sturgeon Bay has 10 cloudy, 9 partly cloudy, 6 sunny, 5 snowy, and 1 rainy day in January. The snowfalls are usually light.