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- Average North American snowpack extent is virtually unchanged in recent years compared to the late 1960s, when satellite measurements began.
- Following a short-term decline in snowpack in the mid-1980s, average North American snowpack has increased.
- There has been only a modest decline in Eurasian snowpack in recent years.
NASA satellites have measured snow cover since 1966.1 The lines graphed in Figure 1 represent 12-month snow cover anomalies, which are a departure from a defined reference point. The blue dots represent North American snow cover
totals. Note that they show almost no declining trend since 1966, and a rising trend since the late 1980s.2 Further, the Eurasian snow data appearing in Figure 1 illustrate there has been a modest decline in Eurasian snow since the 1960s, but that there has also been an increase in snow coverage since the late 1980s.
On a seasonal basis, snowpack throughout the Northern Hemisphere has increased over the past several decades in the fall and winter, as shown in Figures 2 and 3. As these and other data reveal, the only long-term negative overall
snow-cover trends occurring in recent decades have been limited to spring snow cover, primarily in Eurasia.
North American snow cover remains approximately the same today as when coverage was first precisely measured
in the 1960s, and snow cover has been increasing since the late 1980s.
Figure 1. 12-Month Running Mean Snow Cover Anomalies, November 1966–October 2021
Figure 2. Fall Northern Hemisphere Snow Extent
Figure 3. Winter Northern Hemisphere Snow Extent
- See Rutgers University Climate Lab, “Northern Hemisphere Snow and Ice Climate Data
Records,” accessed February 1, 2022, https://climate.rutgers.edu/measures/snowice
- Global Snow Lab, “12-month Running Anomalies of Monthly Snow Extent from
November 1966 to October 2021,” Rutgers University Climate Lab, accessed February
1, 2022, https://climate.rutgers.edu/snowcover/chart_anom.php?ui_set=0&ui_
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