California's summer has been particularly cold and gloomy, with Bay Area temperatures averaging 67 degrees, the lowest since 1965. This weather pattern is caused by the marine layer, formed when warm, dry air meets cool ocean water. Cooler waters off the Baja California coast and upper-low pressure areas have led to more persistent low-hanging clouds. San Francisco has experienced more overcast skies and has seen high temperatures 5 degrees lower than average. This phenomenon is characteristic of the West Coast, unlike the East Coast.
'The cooler waters off the Baja California coast have lingered through mid-July. The cooler waters have allowed upper-low pressure areas to drift into central California and enhance the marine layer for the Bay area.'
'The onshore flow contributes to the enhanced marine layer and this onshore flow is brought on by a series of upper-lows that have been off the coast and pushed inland through the central part of the state this summer.'
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