Climate change is hitting the United States in uneven, localized ways that traditional average temperature data fails to capture. New research published in PLOS Climate suggests that relying on state-wide averages masks the specific, localized heat trends that impact agriculture, health, and policy.
Researchers María Dolores Gadea Rivas of the University of Zaragoza and Jesús Gonzalo of University Carlos III analyzed temperature data from 1950 to 2021. Their study utilized over 26,000 daily temperature readings per state to move beyond simple yearly averages.
A patchwork of warming trends
The data reveals a sharp disconnect between average warming and reality. While only 27 states, or 55%, show an increase in average temperatures, 41 states—roughly 84%—are seeing significant warming in specific parts of their temperature distribution.
Regional differences define these changes. The study found that states along the West Coast are experiencing more frequent, hotter peak temperatures. Conversely, northern states are seeing their minimum cold temperatures rise, effectively losing their most extreme cold days.
"Looking beyond average temperatures, we show that most U.S. states are warming in specific parts of the temperature distribution, even when average warming is not statistically significant," the authors wrote. "This reveals strong regional inequalities in how climate change is experienced across the United States."
These findings suggest that national climate policies may be insufficient if they ignore regional nuances. The researchers argue that because climate change manifests differently depending on the location, adaptation strategies must be tailored to the specific type of heat or cold shifts occurring in each area.
Beyond immediate weather impacts, these shifts carry risks for crop yields and public health systems. The research framework developed by Gadea Rivas and Gonzalo can be applied to other climate metrics as well, including sea-level rise and precipitation patterns, to provide a more granular view of how the environment is changing.
