Yeah interdecadal variability makes it a little tricky, but if you compared the last 20 years to the 1950-2000 average I think you'd probably get a plot that looks fairly similar to the trend plot. There's no doubt that winter snowfall is declining across most of the country.
The starting point and end point always matter with these trend things.
Parts of the East were miserable for snowfall in the late 1940s to late 1950s. And those same areas did really well in the 2002-2015 period. So if you made a trend from 1950 to 2010, it would look way better for much of the East.
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