Summer Nights Are Warming. Here's Why That's A Problem

Summer nights are getting hotter — and that could pose big risks to public health, safety, ecosystems, and agriculture.

In the U.S., summer nights are warming at nearly twice the rate of summer days. Since 1895, when national temperature records began, overnight low temperatures have increased by 1.4°F every century.

This combination of hot days and hot nights means body temperatures don’t have a chance to reset, crops can dry out, and there's more risk for wildfires.