California humidity free? Where , the desert ? Yes. By the Ocean with Coastal fog , No. Not in the forest either.
There is lots of desert in LA and SD county , cactus and rocks, and the desert is typically drier air so.... There's ton's of microclimates, but where it's desert , it is desert, 100 year old water rights channeled from afar can't change that.
California is obviously a large state , a 10 hour drive to traverse. So many microclimates and differences in humidity in my town, and county , much less the state. Lumping all of California into one of anything often does not work.
Fallbrook and Vista you have military drills and really loud helicopter's and planes to contend with with the base right there. I've spent a little sliver of time there and had several unnerving flyover's I was not used to , probly not a big deal if your used to it. Orange county growing conditions seem ideal from the members showing fruit tree pics from there but you have to be down with living in Orange county, A dream for some. You've got to balance enjoying where you live with what you can grow.