They even freak out when it rains a lot. When I first moved to CA, I went to the supermarket when it was raining (October- first rainfall of the season). The market was empty. I asked the clerk why no one was out. She said "It's raining". I said so what. Years later there was an Artesian well that sprung up next to Highway 101 real close to where the Niners stadium now is. Must have gotten buried when it was all farmland. Just a thin layer of water trickling across the lanes. The traffic slowed down from the usual 70-75 to a crawl. If I went through there with no traffic, I would do 65-70. they had to close the highway on a Sunday to cap the well.