Temperatures in the contiguous U.S., excluding Alaska and Hawaii, was 3.8 degrees above normal this year.
“We live in a warming world, so climate change is at least an underlying factor,” Spaccio said. “Without global warming, it may still have been a warmer-than-normal winter, but it wouldn’t have been as warm as it was.”
“The snow season was very good across Maine’s northern climate division, owing to numerous snowfall events and daytime high temperatures generally staying below freezing,” Birkel said. Climate scientists are unsure how the Arctic Oscillation could be changing in a warming world, as long-standing climate boundaries shift.
El Niño is absent in the Pacific this year, making this the warmest non-El Niño winter in history. That points to another culprit.
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