Very interesting stuff. Assuming those are full calendar years and not seasons (so the average would be exactly the same overall anyway, but some of the years might look a little different)
Also, good observation as to the lack of Lake Erie ice coverage perhaps fueling more of these nuisance snows, even if bigger storms have suffered since 2011.
I also think that it’s possible that they were not nearly as dilligent about measuring minor snow in the early 1900s. Look at how many lower snowfall seasons there were. Has our climate changed that much? Probably not...I just think they weren’t measuring every snow shower that came through and perhaps just stuck a ruler in the ground at the end of the day.
Measuring location before 1950 (AGC vs PIT) could be a slight factor, but not much. They are both around 1150 to 1200’