If San Francisco, California and Washington D.C. lie nearly on the same line of latitude, then why is San Francisco cool, foggy, and mild during the summer months and Washington D.C is hot and humid?
?Along with the winds, surface currents distribute tropical heat worldwide. Warm water flows to higher latitudes, transfers heat to the air and cools, moves back to low latitudes, and absorbs heat again; then the cycle repeats. San Francisco, California is located along the west coast of the United States. The California Current carries cold water from the north to the coast. Air normally flows clockwise in summer around an offshore zone of high atmospheric pressure. Wind approaching California coast loses heat to the cold sea and comes ashore to chill San Francisco. Summer air often flows around a similar high off the East Coast (the Bermuda High). Winds approaching Washington D.C., therefore blow from the south and east. Heat and moisture from the Gulf Stream contribute to the capital's oppressive summers.
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