The answer depends on where and how long you scour the landscape (along with luck).
For example, on 12/30, Ruth Rudesill found the following seven species (below account within quote marks) amid the Bodega Bay, Sonoma County area. Hermit and Black-throated Gray Warbler would be two more forest species that are uncommon to rare non-breeding species to see in January along the central/northern coast.
Within Sonoma County (per the below account), two good spots to check in the Bodega Bay area include Diekmann's Deli and Owl Canyon (both of which are highlighted at Colin Talcroft's birding spots of Sonoma Co. via: http://www.colintalcroft.com/Sonoma_County_Bird_Watching_Spots/Sonoma_County_Bird_Watching_Spots.html)
“It was a glorious day at Bodega Bay - sunshine, little wind. At Diekmann's the sun shone on the eucalyptus tree above the store ad had birds! I felt Rich S. was there showing me a Nashville Warbler along with a Yellow, Orange-crowned, Townsend's and Yellow-rumped! Chickadees were calling and it was very special.
Later in the day refound the the Palm Warbler with our group at the Cypress area of Doran Reg Park. (Dea Freid and Mike Parmeter had this bird last week ) but we saw not one but two! 7th species was a Common Yellowthroat.
Later an immature Black-legged Kittiwake flew by us at the Jetty. The male Eurasian Wigeon was at the Doran entrance pond. A flock of 300 Aleutian type Cackler Geese flew over Dea, Scott Carey and me later in the afternoon.
We saw the dark Red-tailed Hawk, , female Peregrine Falcon and the almost adult Bald eagle over the harborside part of Doran Park too
Hopefully others will post their great finds! So glad to have the day off birding with my friends!”