December in Olympic Valley is the coldest month of the year. In December, the weather in Olympic Valley is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, Olympic Valley has 11 partly cloudy, 7 sunny, 7 cloudy, 3 rainy, and 3 snowy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Olympic Valley.