2021–22 North American winter

The 2021–22 North American winter was not as significant and record-breaking as the previous winter season. Despite this, several notable and significant events still occurred, including two separate record-breaking tornado outbreaks in mid-December, a significant winter storm in the South in mid-January, a powerful blizzard that impacted the Northeast coast at the end of January and a wide-ranging, significant winter storm that affected most of the eastern half of the country in early February. Additional significant events included a late-season winter storm in March that affected the Appalachian Mountains, and a major blizzard that affected North and South Dakota in mid-April. Additionally, a very late out-of-season snowstorm struck the Rocky Mountains in late May. During the season, four storms have been ranked on the Regional Snowfall Index (RSI), although none attained the “Major” category. Similar to the previous winter, a developing La Niña was expected to influence weather patterns across the continent.

Based on the astronomical definition, winter began on the winter solstice on December 21, 2021 and ended on the spring equinox on March 20, 2022. Based on the meteorological definition, the first day of winter started on December 1 and the last day was February 28. These dates historically describe the period in each year when winter storms are most likely to occur. However, winter storms may occur outside of these limits, as shown by the early formation of this season's mid-October winter storm on October 12. Since both definitions of winter span the start of the calendar year, it is possible to have a winter storm spanning two different years. In addition, major winter events can occur well after the official start of spring, as close as June in some cases, as shown by a very late-season winter storm that impacted Colorado in late May 2022 with heavy snow following warm temperatures just a day beforehand.