Photo of a thermometer with mercury rising past 100 degrees Fahrenheit in front of a city street backdrop

NOAA leads community scientists in mapping hottest parts of 13 U.S. cities this summer

Running barefoot from scorching asphalt to cool grass in the summertime as a kid, you likely learned how cityscapes tend to get much warmer than green spaces. Extreme heat can be fatal, and buildings and pavement increase its threat, making some parts of cities up to 20°F hotter than other parts.