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Map of April–June snow cover trends across the Northern Hemisphere from 1972–2023 based on satellite observations of the number of days each location had snow on the ground each year. Places where snow-covered days declined by up to three days per decade are shown in brown; places where snow-covered days increased by up to 3 days per decade are blue-green. (Only places that had snow in at least 25% of the years on record are included in the analysis). Most of the Northern Hemisphere has experienced declines in the number of snow-covered spring days over the past 5 decades. NOAA Climate.gov map, based on data and analysis by Rutgers Snow Lab.