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