Boating, Fishing, and Travel Information for San Diego, CA
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Seasonal Weather in San Diego:
The mild climate from San Diego to Point Arguello is controlled by the Pacific high-pressure system. Aided by the sea breeze, it brings winds from off the water, mainly south through north, which help keep coastal temperatures up in winter and down in summer. Coldest average temperatures range from the middle to upper fifties (12° to 16°C), while summertime readings are most often in the seventies (22° to 27°C). Occasionally a hot dry flow off the land in autumn will cause temperatures to soar into the nineties (33° to 38°C), and a rare winter outbreak from the east can drop temperatures to below freezing (<0°C). Winter is the rainy season, although not much rain falls along these coasts.
In the San Diego Bay area, visibilities are reduced to less than 0.5 mile (0.9 km), mostly by radiation fog, on about 3 to 7 days per month from September through April. December is the foggiest month. This fog is worst during the late night and early morning hours. Dense fog is as frequent at North Island as it is at Imperial Beach. However, sound signals indicate that in general it is foggier around the entrance to the bay than it is in the north sections. For example, in December, the sound signal at Point Loma is operating about 20 percent of the time, compared to 10 percent at Ballast Point.
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