Winter is the fastest-warming season for most of the U.S. — affecting snowfall, water supplies, winter sports, spring allergies, summer fruits, and more. In our warming world, the coldest days aren’t as cold and cold snaps are shrinking.
From 1970 to 2025, winters have warmed in 98% of 244 U.S. cities analyzed — by 3.9°F on average. Most cities (88%) now experience at least seven more warmer-than-normal winter days than they did in the early 1970s. Locations across the Northeast and the Great Lakes region have seen some of the highest rates of winter warming:
It's more in Europe, though I don't have data. Just the last 10 years has had an incredible amount of +5-10C days, and eastern Atlantic/Arctic is warm in late fall.