December in Bay City is the windiest month of the year. In December, the weather in Bay City is typically freezing. Average daily high temperature in December is about zero. On average, Bay City has 16 cloudy, 10 snowy, 3 rainy, and 2 sunny days in December. The snowfalls are usually moderate. December as well as March, April, October, and November is considered the most uncomfortable time to visit Bay City.