2024–25 North American winter

The 2024–25 North American winter was considerably colder and much more wintry across the North American continent, particularly in the eastern half of the United States, than the previous winter season. The Weather Prediction Center (WPC) tracked a total of 21 significant winter storms during the winter. The season, marked by persistent rounds of very cold temperatures and impactful winter weather events, started with a powerful bomb cyclone that impacted the West Coast of the United States in mid-to-late November, and a severe lake-effect snowstorm in the Great Lakes later that month. However, the most significant and widespread event of the season was a historic blizzard that struck the Gulf Coast of the United States in late January, in tandem with a severe cold wave that also brought extremely cold temperatures to the majority of the continent throughout much of January, the coldest such January in many years. These two events combined served to be one of the deadliest and costliest events of the season. Six storms were rated on the Regional Snowfall Index (RSI); though similar to the previous winter, none were rated above a Category 3 "Major" event.

Other significant winter events, some ranked on the RSI, also occurred throughout the season, including a wide-ranging Category 2 blizzard that affected much of the central parts of the United States in early January, followed by a another Category 2 winter storm that brought snow and ice to the South, a quick-moving nor'easter that affected much of the Northeastern United States. A pattern change in February brought a series of winter storms and cold temperatures to the eastern half of the U.S., before abruptly ending at the end of the month. A weak La Niña was expected to influence the weather patterns across the North American continent this winter. Collectively, the winter weather events resulted in 55 deaths and at least US$3.38 billion (2025 USD) in damages.

While there is no well-agreed-upon date used to indicate the start of winter in the Northern Hemisphere, there are two definitions of winter which may be used. Based on the astronomical definition, winter begins at the winter solstice, which in 2024 occurred on December 21, and ends at the March equinox, which in 2025 occurred on March 20. Based on the meteorological definition, the first day of winter is December 1 and the last day February 28. Both definitions involve a period of approximately three months, with some variability. Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. Since both definitions span the calendar year, it is possible to have a winter storm spanning two different years.