San Francisco is part of the Mediterranean biome, which includes other areas as well. Mediterranean vegetation dominated by evergreen trees and sclerophyllous trees adapted to fire and to summer drought and cool moist winters
Discussion
The Mediterranean biome receives subtropical dry and warm air in summer accentuated by cold currents. In winter, as subtropical highs retreat toward equator, they experience maritime air masses and cyclonic storms from polar front. These regions have been called 'winter-rain and summer dry' climates. The Med biome is surrounded by deserts and rainforests, and it experiences the effects of both in different seasons. ...