The latest IRI/CPC "plume" forecast is still indicating a minimal La Niña event at best. To that end I have put together a climatology of California precipitation for cool neutral (ONI -0.2 to -0.4) and Weak La Niña (ONI -0.5 to -0.7) events. See http://ggweather.com/enso/ca_lanada.htm and summarized in the graphic below.
Jan Null, CCM
Golden Gate Weather Services