Summer in the San Francisco Bay Area is known for its fog.
Nature abhors extremes. The summer sun heats up the central valley to temps of 100+ Fahrenheit. The fastest way for nature to mitigate this heat is for moisture from the ocean to rush in. The shortest and easiest (least mountainous) path to get that moisture there runs right over San Francisco and the peninsula. As that cold moisture slides by, the fog forms, which dramatically cools the air it is passing through, which encourages more moisture to condense.
The light bounces from droplet to droplet, creating the halos.
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