News Climate Climate change could double U.S. temperature-linked deaths by mid-century Roughly 8,000 deaths in the United States now are associated with extreme temperatures Extreme heat over the summer hammered the United States, as seen in this heat snapshot from June 10 (the darkest red represents temperatures pushing past 40° Celsius [104° Fahrenheit]). The numbers of deaths due to extreme temperatures, including extreme heat and cold, could double or even triple in the next few decades.