I have begun producing an (almost) daily update of California Rainfall Summary, based on the long-established rainfall season of July 1st to June 30th. The data is based on the raw summary put out by the CNRFC, which unfortunately and unexplicitly changed to the October 1st water year (WY), but with the more climatologically sound July to September period added in. An example of the product is below, and the link to the actual daily summary is: http://ggweather.com/seasonal_rain.htm
Also included on the page is a link to the Excel spreadsheet (with instructions) that you can use to create the seasonal summary yourself if I am unable and/or you are impatient. Enjoy!
Questions and comments welcome.
Jan Null, CCM
Golden Gate Weather Services