Chances are you’ve never heard the phrase “danger day” when it comes to weather. That’s because they’re rare. You’ll want to get to know it, though, because climate change is about to make them a lot more common over the next 15 years.
A danger day is when the combination of heat and humidity (also known as the heat index) make it feel like it’s 105 degrees F or hotter. Warming temperatures are about to push U.S. cities into a new regime where danger days happen regularly.
Of the 144 U.S. cities Climate Central analyzed, only 12 of them averaged more than one danger day per year since 1950. Most of those cities are clustered in the South where humidity tends to be worst in the morning while temperatures peak in the late afternoon.
But by 2030, a whopping 85 cities — home to nearly third of the U.S. population — are projected…
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