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Though the hottest recorded temperature in the U.S. was 134 degrees in Death Valley, Phoenix holds the record for the highest temperature in a city with a scalding 122 degrees. Throughout the year, it has an average daily high of 86.6, and roughly 169 days a year are above 90 degrees. Despite the extreme heat, the city’s metro area population is more than 4 million and it’s the fastest growing U.S. city ahead of Los Angeles and New York.