100-degree days are becoming more common in the cities where most people live. These charts explain why.
By Christopher Hickey, CNN Hot summer days in the United States have only been getting hotter. In the 25 largest US cities, days with highs breaking the 100-degree Fahrenheit barrier have become more common over the past 75 years, according to airport weather station data from the National Oceanic and Atmospheric Administration. This year is
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