Traditional Culture Encyclopedia - Weather inquiry - Why doesn't it rain in summer and winter in California, USA

Why doesn't it rain in summer and winter in California, USA

California is located on the west coast of the mainland, 30-40 degrees north latitude. At 30-40 degrees south latitude, the west coast of the mainland is alternately controlled by the subtropical high zone and the westerly belt, resulting in a Mediterranean climate characterized by high temperature and dryness in summer and mild and rainy in winter. Such as Rome, Athens, Cape Town, Los Angeles and San Francisco.