STORY: During heatwaves, the ground really is like lava.This graphic shows two surfaces heating up on a typical hot summer day.One is grass, one is asphalt.The grass heats up roughly in line with ...

According to the U.S. Environmental Protection Agency, the annual mean air temperature of a city with 1 million or more ...

Concrete holds heat for a long time and heats up faster than many materials. These properties make it hot even in the shade. While grass that's in direct sunlight all day rarely gets over 80 ...

Whenever temperature soar into the eighties and nineties, you need to pay attention to the temperatures of the surfaces you ...

Asphalt and concrete in direct sunlight can often reach surface temperatures as high as 82 Celsius (180 Fahrenheit) on the hottest days, said Dr. Kevin Foster, who directs the Arizona Burn Center ...

“Ideally, running on asphalt is [best] in cooler weather when the surface has more give but not too soft. In the winter, like all ground, it is stiff and absorbs shock less effectively.” Concrete ...

Asphalt and concrete in direct sunlight can often reach surface temperatures as high as 82 Celsius (180 Fahrenheit) on the hottest days, said Dr. Kevin Foster, who directs the Arizona Burn Center ...