The fact that you are in Northern Cal probably does not make a difference. Your latitude which determines the length of daylight you have influences your crops more. Depending on strain, it will take 8-12 weeks after you see preflowers (or flowers) depending on strain.
Do you know what strain you are growing? Most breeders have outdoor harvest estimates on their seeds.
the more direct sunlight u have the bigger and tighter the buds will be i like to get atleast 6 hours of direct sunlight on my plants. For me flowering usually starts but around august 1st and hares is end of september to first few weeks of october