The 2023 U.S. Department of Agriculture's "plant hardiness zone map" is about 2.5 degrees Fahrenheit warmer than the 2012 map across the contiguous U.S.
https://www.npr.org/2023/11/17/1213600629/-it-feels-like-im-not-crazy-gardeners-arent-surprised-as-usda-updates-key-map
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