Below is a graphical catalog of the eight La Niña Sea Surface Temperature Anomalies (SSTA) that have occurred since the turn of the century; along with the corresponding California precipitation anomaly, and the previous year's ENSO category.
In broad strokes, over the seven previous La Niñas, four were DRY (2007-8, 2008-0, 2011-12, 2017-18) and three were WET (2005-06, 2010-11, 2016-17) across most of California. And it is interesting to note that all three of the wet years followed El Niño years, while the four dry years followed La Niñas.
The latest forecast from CPC and IRI are pushing this winter into the Moderate La Niña category, and briefly into the Strong range. Last year there was a weak El Niño.
Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services