-ENSO and deep -IOD usually favor a cool December, in comparison to the rest of the season. That was the case in 2016-17 and 2022-23. It's January and February when it really torches.
If December ends with <1 inch of snow, then the winter is in trouble. That's what happened at PHL, BWI, and DCA those winters. PHL got lucky with the March 2017 snowstorm, but the snow totals for those seasons are as follows:
PHL: 0.3 inches 2022-23
BWI: 3.0 inches 2016-17, 0.2 inches 2022-23
DCA: 3.4 inches 2016-17, 0.4 inches 2022-23