J made part of my point. But the larger point was: droughts are retrospective. We have no idea what next winter's going to be like. This time last year NOAA was forecasting a moderate-to-strong El Nino. If that had materialized, the Central Sierra would have done well based on past history. Next winter is an open book. CA had a drought from 2007-2009, and then 2010 and (especially) 2011 were really awesome years. Next year may be too. I'd look at data here to make a more-informed decision:
http://bestsnow.net/pwdrpct.htm
And, like I said, the current ENSO forecast looks strongly positive, which has major implications for Western US precip (e.g. lower in Jackson, higher in Mammoth and, say, Taos).