December in La Crosse is the cloudiest month of the year. In December, the weather in La Crosse is typically freezing. Average daily high temperature in December is about zero. On average, La Crosse has 11 partly cloudy, 10 cloudy, 5 sunny, 4 snowy, and 1 rainy day in December. The snowfalls are usually moderate. December as well as February, March, April, and May is considered the most uncomfortable time to visit La Crosse.