Our mildd winter in most of North America has nothing to due with any kind of climate change whatsoever. This warmth has been the result of the fact that the Jet Stream never dipped south through the central and eastern US, like it usually does. The Artic and Atlantic Oscillations kept the Jet Stream far North over North America and above the Jet Stream in NA it was frigid...Alaska had a bitter winter, evn by their standards. The Jet Stream did dip south...over the Atlantic, and gave Europe and North Africa one of their coldest winters ever. They even had 6” of snow in the Tunisian Sahara.
That’s the way it works.