The coldest air of the season is set to invade the U.S. during Christmas week. Blast of cold should first reach the Washington region between next Friday and Christmas Eve. A significant storm could form around Thursday, but whether there will be snow is up in the air. The National Weather Service continues to forecast a high risk of hazardously cold temperatures in much of the Lower 48 to east of the Rockies. The average high and low temperature in Washington on Christmas Eve and Christmas Day is 47 and 33. Temperatures beyond Christmas look to remain colder than normal, perhaps into the new year.
