December in Klosters-Serneus is the windiest month of the year. In December, the weather in Klosters-Serneus is typically freezing. Average daily high temperature in December is about 1 degree below zero. On average, Klosters-Serneus has 10 snowy, 8 cloudy, 7 partly cloudy, and 6 sunny days in December. The snowfalls are usually heavy.