84% of U.S. States Are Warming in Hidden Ways
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- María Dolores Gadea Rivas (University of Zaragoza) and Jesús Gonzalo (University Carlos III) published the study in PLOS Climate, analyzing temperatures across the contiguous 48 U.S. states from 1950 to 2021.
- Only 27 of 48 states (55%) recorded rising average temperatures, but 41 states (84%) showed warming in at least part of their temperature distribution.
- The researchers used over 26,000 daily temperature readings per state to capture extremes, not just averages.
- West Coast states are seeing higher annual temperature extremes, while northern states are experiencing warmer minimum temperatures—two distinct regional patterns of warming.
- The authors argue these 'strong regional inequalities' require location-specific adaptation policies rather than uniform national approaches.
- The researchers' framework could also be applied to other climate variables, including precipitation patterns and sea level rise.
Why it matters: With 41 of 48 U.S. states warming in some part of their temperature distribution despite only 27 states showing average increases, policies built on average temperatures miss the regional extremes most states face—from West Coast heat peaks to northern minimum rises. That gap carries direct consequences for crop planning, heat-health systems, and infrastructure design.
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