Each has recorded at least 18 extremely hot days this year. San Antonio, Texas, experienced 54 extremely hot days, 16 more than its 2013-to-2023 average, while Nashville, Tennessee has logged 23, also 16 days above average. “The overall trend is clear: major American cities have experienced a significant rise in the number of extremely hot days,” said Tucker Landesman, a senior researcher with the International Institute for Environment and Development. Of the 50 cities, only three — Los Angeles, Omaha and Kansas City — did not experience an increase in extremely hot days over the five-decade period. “As the world’s richest country, the United States has the resources and technology needed to address extreme heat,” Landesman said.

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