Just to address all the people who are saying that people are crazy for fussing about getting sleet on top of a bunch of snow...
For me, it's not about how long the snowpack sticks around. It's as much to do with the feeling of serenity and quiet and just sheer awesomeness of snow falling than anything else. Pouring sleet, while a neat meteorological phenomenon, is like enjoying the outdoors at a national park and then suddenly some dickwad in a souped-up F150 rolls up out of the forest blasting Kid Rock. No thanks, and fuck all that.