2024–25 North American winter

The 2024–25 North American winter was considerably colder then the previous winter season, and much more wintry across the North American continent, signified by several rounds of bitterly cold temperatures occurring. The season 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. Winter events occurred throughout the season, including a wide-ranging blizzard that affected much of the central parts of the United States in early January, followed by a winter storm that brought snow and ice to the South, a quick-moving nor'easter that affected much of the Northeastern United States, and a historic blizzard that struck the Gulf Coast of the United States in late January. A severe cold wave also brought extremely cold temperatures to the majority of the continent throughout much of January, the coldest such January in many years. 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. 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. 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 approximately 52 deaths and at least US$500 million (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 occrured 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.