The Associated Press
Dec. 17, 2021
Since 1980s US chances of a white Christmas melt a bit
A white Christmas seems to be slowly morphing from a reliable reality to a memory for large swaths of the United States in recent decades, according to an analysis of ground observation data led by University of Arizona atmospheric scientist Xubin Zeng. The data show From 1981 to 1990, on average, almost 47% of the country had snow on the ground on Christmas Day, with an average depth of 3.5 inches. From 2011 to 2020, Christmas snow cover was down to 38%, with an average depth of 2.7 inches. The numbers are small enough that it’s difficult to tell whether this is a meaningful trend and, if so, whether climate change or natural weather variability is the cause, said Zeng.