W. Larry Kenney is a professor of physiology, kinesiology and human performance at Penn State; Daniel Vecellio is a geographer-climatologist and postdoctoral fellow at Penn State; Rachel Cottle is a ...

During the hot, humid summer months, meteorologists often discuss the heat index instead of the actual air temperature. But how is the heat index calculated, and why is it more important than the air ...

Extreme levels of heat and humidity are forecast to spread across the country over the next two weeks, blanketing the Southwest, Midwest, and East Coast with high temperatures beginning this June 19 ...

Studies on climate and infectious disease typically focus on temperature's role on disease transmission. However, an international team found that both temperature and humidity contribute to future ...

Some hot days feel even worse thanks to high humidity, trapped heat and dew points. Cities are especially vulnerable. By Nazaneen Ghaffar Nazaneen Ghaffar is a reporter on The Times’s weather team. It ...

Across much of the world, hotter days are no longer arriving alone. The air itself is changing, sometimes turning from dry oven to steam bath, other times drying out even as thermometers climb. As ...

Extreme heat has been breaking records across Europe, Asia and North America, with millions of people sweltering in heat and humidity well above “normal” for days on end. Death Valley hit a ...

The first major heat wave of summer has enveloped much of the midwestern and eastern U.S. in a brutal “dome” of record temperatures and high humidity. The dome phenomenon happens when weather ...