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Changes in January–March snowfall across North America from 1959–2024. Most of the contiguous United States has seen a decline of snowfall (brown) over the period thanks to long-term warming. Farther north, where winter temperatures have room to warm and remain below freezing, snowfall has increased in places (blue). Such increases are consistent with global increases in atmospheric water vapor as a result of warming-driven evaporation. NOAA Climate.gov map, based on ERA5 reanalysis data and analysis by Michelle L’Heureux.