Going back to 1990, 11 years had October freezes in Greensboro. Of those years, one had December snow, more than a trace (9%), (1" in 1993). 10 years out of 31 had snow more than a trace overall (32%) so years without an October freeze had snowfall 41% of the time and with a freeze 9% of the time. A rather small sample size, but an interesting inverse correlation.