Five U.S. Cities Seeing Fastest Summer Warming on Record
Summary
A new study shows that five U.S. cities, mostly in the West and Southwest, have experienced the fastest rise in summer temperatures since 1970. Reno, Nevada, has warmed the most, with an increase of 11.3 degrees Fahrenheit on average, while climate change is the main reason for rising summer heat in nearly all cities studied.Key Facts
- Reno, Nevada, saw average summer temperatures rise by 11.3°F since 1970, the highest increase among U.S. cities.
- Other cities with large summer warming include Boise, Idaho, and El Paso, Texas (+6.3°F), Las Vegas, Nevada (+6.2°F), and Salt Lake City, Utah (+6.0°F).
- The study analyzed 243 major U.S. cities and found that 97% experienced warming in June, July, and August between 1970 and 2025.
- Western and Southwestern cities are warming faster due to climate change and rapid urban growth, which reduces natural cooling.
- Urban development replaces plants and soil with heat-trapping surfaces like roads and buildings, increasing local temperatures.
- Climate change caused most of the long-term warming in 221 of the 243 cities (about 91%).
- On average, U.S. cities warmed by 2.6°F in summer since 1970.
- Warmer summers mean more days with temperatures over 90 and 100 degrees, leading to longer, more dangerous heatwaves.
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