How many white christmases were therein the 20th century?

The number of white Christmases in the 20th century varied by location and specific weather conditions for each year. In the United States, for example, the definition of a "white Christmas" typically refers to at least one inch of snow on the ground on December 25. Major cities like New York and Chicago experienced numerous white Christmases throughout the century, but exact counts can vary based on the criteria used. Overall, many regions in the Northern Hemisphere experienced a significant number of white Christmases during this period.