Thanks, Cory! Based on this earlier blog post about snow during La Niña, there tends to be more snow than average throughout the Northwest when La Niña is present. That study is for all of October–April; for a more season-by-season look, we can go to these composites, which reveal that, during past La Niñas, more than 60% of Dec–Feb and more than 70% of Jan–Mar have been snowier than average through the northwest, including Northern California.