Winter is missing from much of the Northern Hemisphere this year. When will it show up?

Although the cold lodged over the frozen north is intense, it covers a historically small area for this time of year. Jonathan Martin, a professor of meteorology at the University of Wisconsin, wrote in an email that the size of the “cold pool” over the Northern Hemisphere, which is indicated by temperatures of 23 degrees or lower a mile above ground, ranks as the smallest on record for December and early January.