On Sunday, Aug. 16, in the midst of a heat wave that had spread across most of the western United States, the temperature reached 130 F in California’s Death Valley, the hottest reliably recorded on earth. This is only the latest news of heat records being broken, as global temperatures continue to rise, year after year. This July was the third warmest on record, with worldwide average temperatures only higher during the month in 2016 and 2019.
While warm and even hot weather can be enjoyable, extreme heat puts many — especially infants, young children, and older adults — at risk of heat-related illnesses. The frequency of heat-related health issues, such as heat stroke and exhaustion, is directly related to how high temperatures are and the level of humidity. And some U.S. cities are more vulnerable to those conditions. According to the Department of Homeland Security, extreme heat often results in a greater number of annual deaths than any other weather-related hazard.
24/7 Wall St. has identified the country’s 50 hottest cities (with populations of at least 10,000) based on the average number of 90-plus degree days per year using climate data from the National Oceanic and Atmospheric Administration.
In the 50 large cities on the list, the temperature reaches at least 90 degrees Fahrenheit for an average of 67 days or more per year. In some of these cities, the temperature is this high in more than double that number of days (and more) a year.
While Death Valley is not large enough to make the list, several other major metropolitan areas in that part of the country did. The majority of these cities are located in the South and Southwest. Texas has the most cities on this list of hottest U.S. cities, with 16, followed by Florida with eight. Among the other hottest states in the country with numerous cities on our list are Louisiana and Mississippi.
Many of the hottest cities in America are also relatively dense and populous urban areas. As human-made creations such as buildings, roads, and other infrastructure replace natural landscapes, temperatures often rise. The result is what is referred to as a “heat island.” In the evening, the temperature in an urban heat island can be as much as 22 degrees warmer than in nearby rural areas.
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