 It lies at the southeastern extent of the Mediterranean climate region that covers much of California and the northwestern corner of Baja California, and the climate is temperate with winter rains.The pine–oak forests are bounded by the southern extent of the California chaparral and woodlands to the west, by the Baja California Desert to the southwest, and by the Sonoran Desert to the east.These forests are predominantly pine, juniper, fir, and oak.