Settled science from the Economist: You know what causes all these cold winters? Warming. And the warming is making them less cold than they would have been without the warming

Weather and climate: A cold warming | The Economist

Europe’s cold winters and the warmth of the planet as a whole might even be linked. There is some evidence that the summer heat stored in the newly ice-free seas north of Siberia may induce shifts in the atmosphere’s circulation, when the heat is given up to the air in subsequent autumns and winters. Those shifts might in turn encourage seasonal patterns in which the Arctic is warm and the continents below it cold, as in early 2010. Since the sea-ice area looks likely to go on shrinking, such a link, if indeed it exists, would probably mean more cold winters in Britain and much of Europe.

Other research suggests that warming may actually have alleviated recent freezes.