The more snow melting into Lake Tahoe the colder the water will be this summer, right? Wrong. Though it might seem logical that the large amount of snow melting into the lake would affect its temperature, according to Geoff Schladow, director at UC Davis Tahoe Environmental Research Center, that isn’t the case. “Even in the really wet winter that we had, less than 1 percent of the water in the lake changes because of all this rain and snow,” explained Schladow. “Most of that water has been there for hundreds of years.”