Thanks to @Juliancoltonfor that link to the snow maps, I don't recall seeing that before and bookmarked it for future use. We all know that snowfall is the least accurate of weather readings for many reasons. You have slant stickers, car top measurers, and the classic eyeball measuring. Then there are reasonable reasons for differences due to terrain and microclimates which is why I'm not a fan of making broad brush assumptions on average snowfall but sometimes that's all we can go on outside of ones own yard. This is a reason I got a bit more scientific in my measurements and started keeping better records. If I used the measurement I got from my yard on Monday it would've been close to .5 higher than what I had on the board. There are people *cough* @BxEngine *cough* who have been known to not mow their lawn after Labor Day simply so that they can get a higher snow measurement. That may or may not be true but I digress, I encourage anyone that is really interested in snowfall averages, measuring, etc. to get a snow board, a tenths ruler, set up a spreadsheet and start gathering your own stats. Its not difficult but it does take time to to build up the data. That said, there are plenty of people that don't care that much about this and that's fine too.
The average for KMGJ does seem a bit low and I think it may be based off of COOP reporting as the airport itself does not measure as far as I know. The Crist brothers have COOP records from Walden that go way back, that may have been used for all I know. For those that like to look back at weather records I recommend spending some time here looking at old monthly reports: https://www.ncdc.noaa.gov/IPS/coop/coop.html Below is a screenshot of the KMGJ averages along with my own calculated running averages for anyone interested.