No, it's NOT yet the End of the Rainfall Season!!
Despite proclamations by several individuals, the most recent rainfall does NOT mark the end of California's rainfall season. Yes, the amounts drop off significantly as we transition into late spring and summer, but climatologically it would be quite unusual not to have rain in May and June. For example, the last time that San Francisco had zero rain for the months of May and June was in 1978!
Below are the normal rainfall amounts and the normal number of days of rain across California for May and June.
Jan Null, CCM
Golden Gate Weather Services