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To properly interpret the observed shrinkage of the Earth's cryosphere it isimportant to understand global changes of snowfall dominant regimes. Todocument these changes, three different reanalysis products of wet-bulbtemperature together with observationally-based data sets are processed from1979 to 2017. It is found that over the Northern Hemisphere (NH), the annualmean wet-bulb temperature has increased at a rate of 0.34$^\circ$C per decade(pd) over land and 0.35$^\circ$C pd over ocean, resulting in a reduction of theannual mean potential areas of snowfall dominant regimes by 0.52/0.34 millionkm$^2$pd over land/ocean. However, the changes in the Southern Hemisphere (SH)are less conclusive and more uncertain. Among the K$\"o$ppen-Geiger climateclasses, the highest warming trend is observed over the NH polar climateregimes. Over studied mountain regions, the Alps are warming at a faster ratecompared to the Rockies, Andes and High Mountain Asia (HMA). Due to suchwarming, potential snowfall areas over the Alps is reducing at 3.64% pdfollowed by Rockies at 2.81 and HMA at 1.85% pd. On average, these mountainranges have lost 0.02 million km$^2$pd of potential snowfall areas. The NHpotential snowfall areas is retracting towards the North pole over the CentralAsia and Europe at a rate of 0.45 and 0.7 degree pd. Furthermore, terrestrialregions over the NH including the Great Plains in the United States, Canadianprovinces around the Hudson Bay, Central Siberian and Tibetan Plateaus, arelosing as much as 4% of the solid proportion of the annual precipitation amountpd.

On Changes of Global Wet-bulb Temperature and Snowfall Regimes