This is very anecdotal. There were some abysmal winters in Pittsburgh in the ‘90s, including ‘92-93 until that switch flipped in mid-February. Further, every year of the ‘90s reached 60 in either January or February or both, and it was 2/4 or earlier in all but 1992 (2/22) and 1994 (2/18). It got to 70 in February twice in the ‘90s. There were three winters that were above normal snowfall (yes, all three were way above normal snowfall), but there were also 3 years with snowfall totals in the 20s and ‘90-‘91 ended with 17.2” at PIT. The big events you mention were memorable, but outside of those it was a bad decade for snow in general. Early 2000s were a bit better.