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As far as the plants, I'd say it depends on how established they are and each cultivar's particular hardiness. I live in Z10, but my family lives in Z9b in Riverside, and several years ago, I planted them (in the spring) and they've never been dug up. The minimum temps it gets out there is about 25, which is only for a few hours at a time. I am not sure how long your temp stays that cold, but I'd imagine in the bay area, there are a lot of microclimates, as I have friends who live in both Fremont and San Leandro, and while my friend who lives in San Leandro never gets a frost, my friend in Fremont gets hail and on the rare occasion, snow that sticks.
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Yes in the Bay Area we have a lot of microclimates, and as far as snow is concerned that is very rare except on Mt. Diablo which happens every so often. For instance it could be warm where I live, but if I am am going to San Francisco I better bring a jacket (even though it is zone 10). When the temps dip down into the 20s, usually high 20's, it is for a very short period of time. For instance it seems like nothing bigger than a blade of grass gets frost, and that is gone as soon as the sun hits it or even before. This is the usual, if El Nino hits, all norms are out the window. It snowed once that I remember and didn't touch the ground, where I live that is.
The weather here is interesting. I live along the delta which has the sea air coming in, that keeps the temps from getting to hot or to cold. Though the farther you move down the delta and the river more air from the valley comes in which can be hotter and colder. Luckily I live along the delta with its ocean air and it keeps us in 9b.
