 East Los Angeles, the Gateway Cities, and parts of the San Gabriel Valley average the warmest winter high temps () in all of the western U.S., and Santa Monica averages the warmest winter lows () in all of the western U.S. Palm Springs, a city in the Coachella Valley, averages high/low/mean temperatures of 75 °F/50 °F/63 °F, (24 °C/10 °C/17 °C) respectively during the period of cooler weather from November to April.The extreme southwest, around San Diego, has a subtropical semi-arid or steppe climate (Koppen "BSh") as winters are drier there.The southeastern regions have a hot arid climate (Koppen "BWh"), similar to that of the Sahara Desert.