If it sounds like I made this idea up, here is an actual real science report

 Feb. 20 (UPI) -- Global warming will bring milder winter weather to much of the Northern Hemisphere, including Europe and North America. But some climate scientists predict those balmy winter days will be more frequently interrupted by extreme cold.

In other words, winters in the future will be -- rather counter-intuitively -- both warmer and colder.

https://www.upi.com/Science_News/2019/02/20/Climate-change-Winters-of-future-will-be-colder-and-also-warmer/6301549572536/