To find out what the global snowfall trend has been, the hotshot data analyst diligently downloaded all available monthly NASA images from 1980 to 2020 (inclusive), such as the one shown below, and then converted the pixel colors back to data using the provided scale.

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Here over the past 40 years snowfall has indeed grown from 0.6257 to 0.7057 decigrams/m2/s, or +12.77%. This trend, like many, is not global.

It just goes to show that when it comes to the chaotic system of climate, things are never simple and researchers get surprised almost daily.

You can generate your own charts using data archived here.