December in Salt Lake City is the cloudiest month of the year. In December, the weather in Salt Lake City is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Salt Lake City has 10 partly cloudy, 8 sunny, 7 cloudy, 3 rainy, and 3 snowy days in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Salt Lake City.