critter, I think it's always a chance for snow in the higher elevations, as the previous posts attest to. My personal story about snow and Colombus Day was in 1994, when we climbed Marcy from ADK Loj. It was about 50 deg. at the Loj. However by the time we got to the Phelps Trail intersection, it started snowing. By the time we gained the top, it was near whiteout conditions, with very strong wind gusts. We hunkered down behind the summit boulder, and got out of our wet clothes and into dry, warm clothes. Then it was back down to the relative balminess of the woods where the temp was in the 50s, and the shorts went back on.
No matter where you go that weekend, BE PREPARED for temperature and condition changes. Have fun, and it's to bad your friend is paranoid about snow. It won't limit your fun, just be ready for it.