I was looking at PHL and technically it wasn't snowless in December due to the inverted trough that gave 0.3" of snow there. So I went back to 1951 and found (8) winters where there was a weak or moderate El Nino and where there was also 0.3" or less snow at PHL in December. (2) of those years also had measurable snow in November. The seasonal totals for those (8) years ranged from a low of 5.1" in 1958-59 to a high of 54.9" in 1977-78. 1958-59 had no snow in November while 1977-78 had 0.2". The average snowfall for those 8 years at PHL was 24.6", which is about 2" above normal. Of course if you took 1977-78 out it would be about 2" less than normal (20.2"), but why would we do that?
So far this winter PHL has had 3.9" of snow.
Even though our samples and locations are different, they both point to a reasonable chance for at least normal snowfall from January through March.
Disclaimer: Based on the unusual atmospheric goings on, due to climate in general and just because, analogs may have limited value currently (uncharted territory in some respects it appears). At the same time, going with what we do know, it's way too early to toss in the towel. And remember how the seasons have seemed to lag the last couple or few years.