Neverwashasbeen posted the best link for the local forecast on the peak. Check it again before you head out, as they'll put the number of "inches of snow expected" only for forecast periods within the next two days (accurately predicting snow amounts is tougher when it's three or more days away). Hopefully you'll not only be prepared for some snow, but actually get some as well; waking up in a tent surrounded by fresh snow is a memorable and magical experience. As long as it isn't
Too Much Snow, that is, and you can still find your way back without an obvious trail to follow. But that's what being prepared is all about. And predictions aren't always accurate.
Anyway, the above link is good for predicting the future, but sometimes it's fun to know about the past. When you get back you should check the actual temp/wind/humidity data from the Long Valley weather station (MSJC1):
http://www.wrh.noaa.gov/mesowest/getobext.php?wfo=sgx&sid=MSJC1&num=168&raw=0&dbn=m