Since you mentioned NYC, I took a look at the data between Baltimore and NYC to see how much disparity there was each decade.
Turns out, from the late 19th century to 1990, NYC averaged 25% more snow than Baltimore. The highest decade I found was 75% more for NYC (1940s), while the 1960s actually had slightly more snow in Baltimore.
In the 90s and 00s (including 09-10), NYC averaged around 35% more than Baltimore.
But since 2010, NYC averaged more than 2x the snow of Baltimore, which is completely unprecedented. It is very apparent just from the raw numbers that something has clearly changed. The NY and NNJ snow weenies should take this all as a cautionary tale, because the change isn't stopping any time soon and they aren't going to like where it may eventually take them.