Climate crisis: extremely hot days could double in US, study shows

Amid widespread US heatwave, experts predict dangerous extremes in summer temperatures will only get worse

As the climate crisis progresses, the number of extremely hot days around the US could more than double, according to a peer-reviewed study and report from the Union of Concerned Scientists.

By mid-century, an average of 36 days a year could feel like 100F (37.7C) or hotter. Toward the end of the century, 54 days a year could feel that hot, researchers with the science advocacy group found.