Caldecott Tunnel - Weather Phenomena

Weather Phenomena

Weather conditions can vary greatly from one end of the tunnel to the other. In summer, for example, motorists may enter the tunnel from the east where it is sunny and warm, and emerge on the west end into fog and cold. In winter, during spells of inland tule fog, the reverse can occur.

On a sunny day, it may be well over 90° at the east portal, due to the inland nature, while a more coastal-like 70° on the Oakland side.

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