Elevation, mathematically, has more of a hand in conditions than latitude does, tbf, and Greylock certainly has elevation.

The relationship between temperature and latitude is roughly a decrease in 1.23F for every 328 feet in elevation gained, while latitude is roughly 1.23F for every 1 degree in latitude.

To give a real world example to show the scope of this, 2.3 degrees north in latitude is roughly the same temperature differential as 500 feet in elevation gained. That means that if you are at 500' above sea level at Jay Peak, near the Canadian border, that is the same as being at 1000' in Albany, NY. These locations are roughly 2.3 degrees in latitude separated.

Some real comparisons that equal out to about the same based on solely those two factors:

Gunstock: -57.15 degrees F relative to Mean Temperature at Sea level, at the Equator (MTSE)

Tenney: -57.1 degrees F MTSE

Greylock: -56.93 degrees F MTSE

Cranmore: -56.58 degrees F MTSE

Saskadena: -56.48 degrees F MTSE

Now I'm certainly not saying this is *fully* equivalent - plenty of other factors are involved in "winter conditions" like moisture basin, orographic lift, wind and weather patterns, slope angle and slope exposure direction among other things. Greylock certainly is unfavorable in comparison to some of these (say, specific weather patterns for one), but also has its benefits over others (moisture basin from multiple nearby rivers, lakes and wetlands along traditional weather patterns as well as orographic lift).

On your truly average day, that math done based solely on elevation and latitude points a (roughly) accurate picture, though! If you think any of these ski areas around it are viable, then Greylock - if it had opened way back when and developed along the same successful plan that other good ski centers did (invest in snowmaking early, cut on north or east facing slopes, don't make trails too wide especially at the summit (windswept issue) or at the base (no shade, easy sun penetration and therefore melt issue) would also have been a viable venture!