Hey, the winters in California are notoriously brutal....
The Bay Area, while still far better than the mid-West or some hellish place, is not your standard 70* winters with sun all the time.
Different parts of the Bay Area are better/worse than others. You can be in Danville and it's beautiful and like being in Florida. Then you travel 25min to SF and it's cold, foggy, drizzling and that's a good day!
Like Mark Twain once wrote: "Coldest winter I ever spent was a summer in San Francisco."