In December, the weather in Wisconsin Dells is typically freezing. Average daily high temperature in December is about zero. On average, Wisconsin Dells has 10 partly cloudy, 9 cloudy, 7 sunny, 4 snowy, and 1 rainy day in December. The snowfalls are usually moderate. December as well as February, March, April, and November is considered the most uncomfortable time to visit Wisconsin Dells.