Check out http://www.sonomavalleyproperties.com. you will find a lot of information about sonoma's neighborhoods.
It is the top of the bay and as such it is always going to have wind as the warmer air suck the cool air into the valley every night in summer. If you look at the topography going west from there it is a low spot all the way to the ocean. If you want to be protected from the wind look for a homesite that is protected from the west, either below a hill or behind a wind break of trees.
When asking the how does it affect values question, I advise you ask yourself how much more would you pay for the identical house if it was in a protected spot. You are a ready and willing buyer and are the best represntation of the next ready and willing buyer.
Obviously you can grow a wind break and improve the value of the property while you are there. A line of junipers or bamboo work very well and you see them all over the area.