I'm not sure if frequency of Nor' Easters are exactly a solid metric of climatology. There's so many confounding variables such as ENSO, oscillations factors, not to mention storm subtype classifications that would have to be controlled for to make sense of the data. The occurrence of a snowstorm in CHESCO is too rare and random an event to really make any sort of statistical analysis out of. The one study that once got my attention on a similar matter used a statistical method called bootstrapping (to show an eastward shift in Tornado Alley). This got around the meta-factors and stochastic principle. Its also worth noting that its a much larger area with many more data points than IMBY MECSes.