I LIKE seasons. I LIKE snow. I LIKE watching leaves fall in the autumn and rebirth in the spring. I LIKE sweaterweather falls and, cold winters, and hot summers.
San Francisco's climate has "mild," going for it. It seems to be permanently pants and tee shirt weather (but don't forget your jacket). The summers (sept/oct) are nice, but limited for what you expect in California. It's frequently windy when the sun is shining, and the fog is constantly sitting nearby, threateningly.
The best you can say is SF's weather is different, but I certainly do not understand the hype.