There are still significant warm spells in the High Arctic lately, last week over Cornwallis +4.8 C was measured along with freezing rain on the ground at -2 C, a plane flying over Lancaster Sound measured +10 C..
The paper also finds that several significant past climate fluctuations — including a warmspell that peaked around 1100 A.D. called the medieval warm period and the so - called little ice age from the 1400s through the 1700s — were global in scope.