The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air ...

The more you exercise in both heat and humidity, the more your body will adapt and improve its ability to cool itself, Dr. Smith said. (The same is true, only reversed, for cold weather.) ...

Therefore, a 70-degree day with 50% relative humidity would feel more humid than a 40-degree day with 100% relative humidity. This is the result of higher dew points, says the Weather Service.

Signs your home humidity level is too high or low In addition to keeping an eye on the humidity level displayed on your thermostat, there are other signs that it could be getting too high or low.

You're not imagining it. Humidity really has gotten worse in the last 40 years. As temperatures rise across the U.S., here’s what you need to know about high humidity and how it can affect you.