It's a T-shirt kind of day in Washington, DC: 85 degrees with 63 percent humidity. We all know those numbers mean hot, but what exactly does that humidity percentage tell us? And why should we care?

Meteorologist Paul Douglas answers reader questions about the weather and other natural phenomena every couple of weeks. Submit your own questions below. I’ve lived in other parts of the country, and ...

I know in Houston, we hear the term humidity which is used to correlate to how muggy it may feel outside. But what actually is humidity and what does it represent? Humidity is the measurement of water ...

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 ...

Humidity - arguably the most important factor in deciphering how pleasant a day will be. We all know 90 degrees with high humidity and 90 degrees with no humidity is a different ball game. The ...

Relative humidity is not a good way to tell if we have muggy air on the way. Here’s why. The key word in relative humidity is relative. The humidity percentage is given, relative to how much moisture ...