Answer :
Because of the coastal mountains and greenhouse gases, California has a high-pressure environment that makes it hot. It stays hot for the majority of the year in California because of the state's high sunshine and low rainfall.
Why are Dallas, Atlanta, Charleston, and Southern California warmer in the winter than places at a same latitude?
Most of the year, the Pacific Ocean on the West Coast is significantly colder than the Atlanta Ocean on the East Coast. Los Angeles, at 33N latitude, is warmer during the winter than Houston, at 29N latitude, despite the West Coast of North America lacking the Gulf Stream, which brings warm tropical water.
Mountains make a difference. Between the High Plains border in North Dakota and the Texas Gulf Coast, there are no mountains. The Arctic might bring frigid air to Texas. The frigid temperatures of the Blue Norther can kill even palm trees as far south as Texas and as far north as Florida. West of the Mississippi River, the Rocky Mountains obstruct some of these arctic Canadian air masses. As they travel further west, the tall Sierra Nevada Mountains further prevent California from being reached by freezing temperatures. Significant temperature shifts result from winter storms that are cold in the Gulf of Alaska warming up across the Pacific Ocean.
The "wet" season in Southern California, which lasts from late November to early April, is often irregular and is broken up by extended stretches of winter sunshine. Offshore winds have the potential to produce heat waves in the winter. The nation's warmest maximum temperatures have occasionally been recorded in California during these winter months. The hilly terrain creates microclimates where temperatures hardly ever frost and never drop below 40. The last time it touched freezing in Los Angeles and San Diego was years ago. It is therefore feasible to grow subtropical trees, fruit-nut trees, and flowers that are unique to South Florida or Hawaii.
However, it is typical for nightly lows to drop well below 50F and into the 30s throughout the winter in the interior. Even if one lives close to the beach, it's typical to switch on the furnace in the winter to stay warm. Frost is sporadic, but historically, subfreezing nights have been experienced in low-lying, wind-protected locations.
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