Extreme Heat in the U.S., By the Numbers

Written by on July 20, 2023

As a heat wave scorches much of the Northern Hemisphere, large portions of the United States are experiencing record temperatures — and the growing danger and discomfort that come with them.

Phoenix, one of America’s hottest cities, has never been this hot for this long. And even places not known for heat, such as Northern California and Alaska, are recording unusually high temperatures this summer.

Here’s what the numbers tell us about the heat and how it is affecting Americans:



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