 The high mountains, including the Sierra Nevada, the Cascade Range, and the Klamath Mountains, have a mountain climate with snow in winter and mild to moderate heat in summer.Ski resorts at Lake Tahoe, Mammoth Lakes, and Mount Shasta routinely receive over of snow in a season, and some years, substantially more – leading, for example, to annual ski races on the Fourth of July.On the east side of the mountains is a drier rain shadow.