By Linda Lam, Weather.com
As we head into the first full week of January, the coldest temperatures of the season so far will plunge into the Midwest and East.
This blast of cold temperatures will be different than the Arctic chill that ended 2014, which was mainly confined to the northern tier. This time the frigid air will push farther south and east.
Two rounds of Arctic cold will move through much of the U.S. this week. The first blast moves in behind Winter Storm Frona and begins in the Plains on Sunday and into the Midwest on Monday. High temperatures will be up to 25 degrees below average and will not reach above the freezing mark as far south as Oklahoma and the Texas Panhandle.