Lake Tahoe, CA Surpassed Average Annual Precipitation on Jan. 18th | Tahoe Has Seen As Much Rain as Snow This Year… Lake Tahoe, CA reached its average annual precipitation of 60.94″ on January 18th. ย Wow! A ‘Water Year’ in California begins on October 1st and ends on September 31st. Of all the precipiation that has fallen at UC Berkeley’sย Central Sierra Snow Lab at 6,900′ on Donner Summit, CA, 47% of it has fallen as rain and 53% has fallen as snow. […] SnowBrains | February 10, 2017 1 Comment