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Heat Waves in U.S. Cities have Nearly Tripled Since the 1960s

Heat Waves in U.S. Cities have Nearly Tripled Since the 1960s

Heat waves are hitting harder and more often. From 23.8 heat wave days in the 1960s to nearly 70 in the 2020s, the US sees longer, more intense heat periods. 2023 was the warmest year on record globally, with major US cities particularly feeling the rise.