Average summer temperatures in the Eastern Canadian Arctic during the last 100 years are higher now than during any century in the past 44,000 years and perhaps as long ago as 120,000 years, newfound evidence indicates.
The new research offers the first direct evidence that the present warmth in the Eastern Canadian Arctic exceeds the peak warmth there in the Early Holocene, when solar energy reaching the Northern Hemisphere in summer was roughly 9 percent greater than today, said Gifford Miller of the University of Colorado, Boulder (CU-Boulder), who led the study. The Holocene is a geological epoch that began after Earth’s last glacial period ended roughly 11,700 years ago and which continues today.
Miller and his colleagues used dead moss clumps emerging from receding ice caps on Baffin Island as tiny clocks. At four different ice caps, radiocarbon dates show the mosses had not been exposed to the elements since at least 44,000 to 51,000 years ago....
http://news.agu.org/press-release/new-study-finds-unprecedented-warmth-in-arctic/
) higher global surface temperatures provide more energy to drive things such as wind. That means cold air gets further south in winter. That means that places further south get more cold air than they used to and cool down in winter.