Coldest winter I ever experienced was the summer I was in San Francisco. In all seriousness, I was there in July and my wife and I thought, California in July, it'll be nice. Packed all shorts and t-shirts. Well, we bought jackets to go to Alcatraz. Bought hoodies to walk around Pier 39 and the zoo. Had to wear both the new jackets and hoodies to watch fireworks on the 4th of July...****ING FREEZING. Of course, went to Napa and Sonoma and it's 85+. Just weird how much the weather can change just a few miles inland.