Breaking Through the Fog of San Francisco’s Weather Reputation

The first thing visitors in San Francisco learn: Wear layers.

You wake up to chilly fog. The sun breaks through during lunch. By dinnertime, you are shivering as the fog rolls back in, and it’s clear you’re a tourist.

Residents like to say there is greater weather variation in a single day than in a whole year.

That’s not as hyperbolic as it sounds. Just take a look at the weather last week.

Temperatures sank to 57 degrees before dawn on Sept. 11, but by late afternoon downtown San Francisco reached 82 degrees. That’s a 25-degree swing when the average range for early September is around 15 degrees, according to the National Weather Service Forecast Office.

http://www.nytimes.com/2014/09/21/upshot/breaking-through-the-fog-of-san-franciscos-weather-reputation.html?abt=0002&abg=1