Big Bear Mountain Webcam showing current snow conditions in Big Bear Mountain. There is daylight for 10 … The snowfall history of Big Bear shows that it there is a possibility for a white Christmas, but not a guarantee. This is the question that is likely on the forefront of holiday traveler’s minds. Temperature highs reach 47°F and lows drop to 21°F. With an average snowfall of 12.3 inches, it is usually mid December when the ski and snowboard season starts in Big Bear Lake. The first set of monthly snow totals are averages for 2010 to 2019. Free Long Range Weather Forecast for Big Bear Lake, California December 2020. Plus there's information on when Big Bear Lake can expect the first and last snowfalls of the season. All the other numbers are averages, based on weather data gathered from 1981 to 2010 at Big Bear … Our snowcam page includes an archive of daily webcam images of the snow in Big Bear Mountain, plus an archive of the … Chance of Snow Storms for Big Bear Lake, California covering the 2020-2021 Snow Season. Does it Snow in Big Bear in December? December through April is typically when it snows in Big Bear… Calendar overview of Months Weather Forecast.