It's not a myth here....I have a standard that I measure snowy months by and above and beyond everything else, it means number of double digit snowfalls. And January in the 80s had zip zero zilch nada double digit snowfalls here after 1982 (the only double digit January snowfall that I can remember was January 1982) and lots of events that were suppressed to our south or that cut. I was in Brooklyn or the south shore of Nassau County during the 80s (1980-1982 Brooklyn, 1983 and beyond in southern Nassau.)
Our new warmer climate has actually meant much more exciting Januarys with bigger snowstorms. Having lived throughJanuarys during the 80s, they were much colder, but also dull and boring with lots of little 1-2 inch events and an outlier 4" event here and there. Even the so-called "exciting" events like Jan 1987 and 1988 didn't hit double digits.