“Other cities with temperate climates may start to experience heat like Phoenix’s in the coming decades, said Ariane Middel, a professor of urban climate at Arizona State University. ‘We are almost a living laboratory. We can test strategies and see different ways to keep adapting and mitigating.’ “‘By the time it gets hot in other places,’” she said, “‘they can take what we have learned here.’”

“Night is not the respite from heat in the way it once was. According to the Arizona Department of Water Resources, nights are roughly nine degrees hotter than in 1948. The increase is due to global climate change and to the urban heat island effect: Sunbaked structures release the day’s heat and air conditioners pump heat outside.”

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