If you take the 30 year data from 1930-1960 you have 123.6 inches for a 30 year average of 4.12 inches. If you take the 30 years from 1992 until now you have 121.5 inches for a 30 year average of 4.05 inches.Hit that link and look at the recorded events at GSP since 1879 or so.
What was stunning to me was the lack of big snows & just Snow in the 50's & before all the way back to the late 1800's.
I was under the impression that the western Carolinas & NE GA averaged much more snow before the 60's.
Their was many many years with Trace amounts before AGW.
IMHO there's other things going on than just Climate change.
Cities & population bases are much larger causing more heat islands.
That's splitting hairs and suggests averages haven't fallen as much as one would think. The 60s thru 80s skewed the numbers up. But what is missing is the complete lack of big years. Even from 1930 to 1960 there were some very big years in there and that kept the averages up. Otherwise they would have been abysmal. The last 30 years have featured more consistent snowfall than the 30s thru the 50s but complete lack of double digit years. That has to be because we waste a lot of precip on rain changing to snow or the warm nose changing us to sleet on the backside probably because of a warmer climate. If we still have the 15-20 inch years every few years we'd be living in the golden ages of snow.