Coastal California sees rain from about the end of October through February, then tapers off to about nothing by May. It then does not rain again until Hallowee

Coastal California sees rain from about the end of October through February, then tapers off to about nothing by May. It then does not rain again until Halloween. I used to think "doesn't rain" meant "half an inch every couple of weeks" but it does not rain in fact at all, it's totally bone dry for the hottest part of the year, until late fall. Getting three inches over the weekend is enough precipitation in the bay area to warrant flood warnings for several days. Compared to Dallas Texas where three inches in an afternoon might cause very localized flooding for an hour or two. It's quite bone dry here in the summers, the ground is literally "tinder dry" for months on end. If you look at meso scale weather, there's a high pressure zone that develops between San Fransisco and Hawaii every summer which wards off low pressure (rain) systems. Generally develops by early June and lasts through August. Research "Pacific High" or "TransPac weather routing" or "Pac Cup weather routing" it's a major component of Pacific Ocean sailing races