While much of the Western United States is basking in unseasonably warm temperatures, California's Central Valley is experiencing a distinct chill. Unlike its neighbors, the Central Valley is set to remain significantly cooler due to persistent and extensive cloud cover. This blanket of clouds acts as a natural insulator, preventing the sun's rays from adequately warming the ground. As a result, daytime high temperatures are expected to hover primarily in the 40s, a stark contrast to the warmth felt in surrounding regions.