(SFGate) - A wet start to the rainy season means much of the Bay Area enters winter with well above average rainfall. 

The National Weather Service released maps on Thursday showing the majority of the Bay Area at over 110 percent of normal for this time of year. Much of Santa Clara and Contra Costa counties have seen over 150 percent of normal, with dotted areas in the state seeing as much as 400 percent of the typical rainfall by December 20th.  

"Since October 1st many areas located in Northern and Central California have received above normal rainfall, especially from Santa Cruz northward," the National Weather Service wrote on Twitter. "Drier than normal conditions are more common for many places south of Santa Cruz."

Most population centers fall well below 400 percent, with spots like Berkeley and the San Jose Airport actually pacing below normal for this time of year, according to numbers from Weather Underground. San Rafael, Fremont and Santa Rosa are among the cities that have seen well over 150 percent of the typical totals. 

The first sizable storm of winter is expected Friday. That system is projected to bring more rain to the Bay Area and inches of snow to the Sierra.