Why don't central and Southern California have a marine west coast climate?

Central and Southern California do not have a marine west coast climate primarily due to the influence of the Sierra Nevada mountain range, which creates a rain shadow effect, limiting moisture-laden air from reaching inland areas. Additionally, the region experiences a Mediterranean climate characterized by dry summers and wet winters, influenced by high-pressure systems in the Pacific. The warm California Current also contributes to the overall climate, preventing the cooler, wetter conditions typical of a marine west coast climate from establishing.