@The_MS well it varies a lot, I live in Santa Cruz area which is coastal and about 20 miles from the Pond. The rain season is recorded Jul 1 to Jun 30, here are the rain totals for the last 10 years:
Season Rain, 2020-2021 22.31 in
Season Rain, 2019-2020 30.39 in
Season Rain, 2018-2019 63.00 in
Season Rain, 2017-2018 30.90 in
Season Rain, 2016-2017 95.17 in
Season Rain, 2015-2016 47.06 in
Season Rain, 2014-2015 33.82 in
Season Rain, 2013-2014 20.78 in
Season Rain, 2012-2013 35.54 in
Season Rain, 2011-2012 36.27 in
Season Rain, 2010-2011 62.55 in
Note 5 years ago we had rain forest amounts of rain. This year will end at 22.3 which is really low.
CA has not built any new dams or reservoir capacity in like 50 years. The Anderson Dam retrofit project is really important as that reservoir was being kept at low level as the dam had some of the same problems as the Oroville Dam. When completed (in 10 years ! ) Anderson will operate with full capacity it is the largest reservoir in the San Jose area.