Dreaming of a white Christmas is a tradition for many, but the reality of snow on December 25th depends on a variety of factors, including climate and weather patterns. As atmospheric scientist Colin Zarzycki explains, the likelihood of snowfall on Christmas Day is influenced by both the overall climate of a region and the specific weather conditions leading up to the holiday.
According to data from the National Oceanic and Atmospheric Administration (NOAA) covering the period from 1991 to 2020, certain regions in the United States are more likely to experience a white Christmas than others. Areas with higher elevations, such as the Rocky Mountains, and the northernmost parts of the upper Midwest and Northeast have a higher probability of seeing at least an inch of snow on the ground on Christmas Day. On the other hand, states in the South, like Kansas, Kentucky, and Virginia, have lower odds of experiencing a snowy holiday.
As global temperatures continue to rise, the window for winter precipitation to fall as snow is narrowing. Warmer temperatures mean that snowfall is more likely to occur in the most northern locations and at higher elevations. In some regions, the first snowfall of the winter season is arriving later, and the chances of a white Christmas are diminishing. For areas that rely on lake-effect snow, the delayed freezing of lakes due to warming temperatures could lead to increased snowfall in those regions.
While overall trends point to a decline in the frequency of snowfall in many areas, there are exceptions. Intense snowstorms fueled by warmer temperatures could result in more snowfall than in the past, particularly in regions like southern Canada and the northern U.S. However, if winter temperatures continue to rise, the likelihood of snow during storms may decrease, with rain becoming more common.
Looking ahead to this year, current forecasts suggest that a snowy Christmas is unlikely for most of the country. A winter heat dome is expected to bring higher-than-normal temperatures across much of the contiguous U.S., leading the National Weather Service to humorously remark that some regions may be “trading the Snowman for a Sunburn.”
As we navigate the changing climate and its impact on winter weather patterns, understanding the factors influencing a white Christmas can help us appreciate the magic of snowfall on this special holiday.
