MOLINE, Ill. — You hear us talk about it on a fairly regular basis during the summer months. It's not the heat, it's the humidity! So thick, you could slice it with a knife! The air you can wear, ...

Across much of the world, hotter days are no longer arriving alone. The air itself is changing, sometimes turning from dry ...

Checking the temperature reading during a heat wave won’t tell the whole sweltering story. It’s going to feel a lot hotter. Blame the heat index, also called “apparent temperature.” It’s a combination ...

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 ...

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 ...

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 ...

Imagine you’re sitting among friends on the porch with a big pitcher of ice cold lemonade. The heat is searing and the air is still and stifling. It’s almost hard to breathe. You look to your friends ...

Relative humidity measures how much moisture is in the air compared to how much it could hold at a given temperature. It is simply the dew point temperature divided by the air temperature, times 100.

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 ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Extreme heat waves can cause cases of dehydration, exhaustion, heat stroke and even death. But ...