Palomar Mountain, CaliforniaPalomar Mountain is an unincorporated community in San Diego County, California.DescriptionThe community is located near the north-central edge of San Diego County within the Cleveland National Forest, southeast of Palomar Mountain State Park and southwest of Palomar Mountain and Palomar Observatory.ClimateAccording to the Köppen climate classification system, Palomar Mountain has a warm-summer Mediterranean climate, abbreviated "Csa" on climate maps. Annual precipitation on the mountain averages about 30 inches, mostly falling between October and March. Snow falls during cold winter storms. Summers are mostly dry, except for occasional thunderstorms in late July to early September. The humid climate supports woods of oak, pine, fir and cedar on large swaths of the mountain.