Historical odds of measurable snow on the ground Christmas morning aren’t even 10 percent. A major storm is setting up a pattern realignment that should promote a cold and possibly stormy week. Chances for accumulating snow will increase in northern Maryland and especially north of the Mason Dixon line. The National Weather Service has put together a handy set of infographics illustrating white Christmas histories all across the U.S. The graphic below is based on weather observations maintained at Reagan National Airport. In longer weather records dating back to 1888-1889, Washington has seen a white Christmas 13 times.
