Hot Days and Hot Nights

Source: Climate Central

As our climate warms, summer is heating up across the U.S. But summer warming isn't all about scorching days. It's also about sweltering nights. Summer temperatures are also rising after the sun goes down. In fact, summer nighttime lows across the U.S. have warmed nearly twice as fast as summer daytime highs since records began in 1895. Since 1970, summer nights have warmed in 230 U.S. locations analyzed by Climate Central - by 3°F on average. When nights don’t cool off enough relative to peak daytime temperatures, people have a harder time cooling off and recovering from the heat of the day.

Scorching days followed by sweltering nights limit the body's ability to efficiently cool off without costly and energy-intensive air conditioning. And as the planet heats up, these dangerous combined hot summer days and nights are on the rise in the U.S. and across the world.