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.
Image source: Zoe Phin.
It seems NASA does not make this data directly available, or at least makes it almost impossible to find, and so for Zoe it was the only way for her to extract the dataset.
“As far as I know, you will not see this anywhere else,” she notes at her site.
Global snowfall rises 3% since 1980
After crunching all the data, here’s the global snowfall trend that emerges:
Snowfall in decigrams/m2/s. Chart: Zoe Phin
Lo and behold, “snowfall has increased by nearly 3 percent over the last four decades,” she concludes. Globally it went from 0.2773 to 0.2854 decigrams/m2/s, which is +2.90% more.
More snow in the south, less in the north
Zoe also broke it down into the northern and southern hemispheres. First we look at the northern hemisphere: