December weather forecast in Mammoth Lakes

In December, the weather in Mammoth Lakes is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Mammoth Lakes has 12 sunny, 10 partly cloudy, 5 snowy, and 4 cloudy days in December. The snowfalls are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Mammoth Lakes.