Fires are common in Mediterranean climates that are kind of on the cusp between desert and wet temperate climates.
Here in Northern California, we see heavy rains and Pacific Northwest temperate rain-forest conditions during most winters, and Baja California like desert conditions with zero rain during the summer.
So vegetation grows rapidly during the late winter and spring, then dries up and becomes extremely flammable in the late summer and fall. You see similar things in Spain, Italy, Greece and in places like that.
Much of the native vegetation in California has evolved to be fire tolerant. Some plant species even require fires in order to reproduce. There are pine species whose cones won't open unless there is fire.