Expect the clouds to linger through Thursday with overnight lows around freezing. The Delaware Valley and south did manage to get into the low 50s.
Monday: Sunny, with a high near 49.
"There's really only one more day left of warmer temperatures", said Jordan Dale, a meteorologist with the National Weather Service in White Lake Township on Monday.
The image above shows you the expected temperature anomalies on Saturday, December 9, 2017. This doesn't look like a big storm, but may be disruptive as temperatures will be so cold at the surface that snow will likely stick. Southeast wind 7 to 9 miles per hour. You can see the eastern half of the USA can expect temperatures from 5 degrees below normal to 20 degrees below normal.
THURSDAY: Mostly sunny and cool.
And so comes Tuesday.
While that cold and dry air steadily overtakes the Eastern Seaboard, that cold front will stall out just off the coastline and sprawl from the Gulf of Mexico to the North Atlantic. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday unseasonably warm air moves in with mid to low 70s likely! A few spots might even push 60 degrees. By Sunday night, rain will turn to snow as the cold front sets in.
"On Wednesday there will be gales across the United Kingdom with a band of rain working its way across the west".
Tuesday: A 40 percent chance of showers, mainly after noon.
By Friday, the cold is expected to be felt across most of Britain, with hail, sleet and snow all forecast.
First, scattered showers will move in Tuesday morning with very mild temperatures in the 40s.
"Through mid-December and potentially right up to the winter solstice (on Dec. 21), residents across the eastern US will have to contend with the cold weather", he said.
After a warm weekend, Boulder should see a drop in temperatures this week, according to the National Weather Service.