Getting good permanent snow cover by Tday is extremely rare outside of NNE elevations.
Getting a white T-day isn't too hard but still uphill climb....prob like 20-25% shot in ORH and way less in BOS.
I think these are the White T-days in ORH in the past 4 decades:
1985, 1989, 1994, 1996, 2002, 2005, 2014, 2018. Thats 8/37.