NORFOLK, Va. — Most summer days, you hear us talk about “humidity” when describing how the air feels. While many people are familiar with the term relative humidity — the percentage of water vapor in ...

Heat and humidity will once again smother the eastern half of the country this week, pushing the heat index to dangerous levels for tens of millions of people. In the Midwest, the humidity will be ...

The Chicago area is bracing for extreme heat and humidity in the coming days, and experts said it could become more common with changing weather patterns. A Chicago doctor said extreme humidity ...

Researchers believe there's an upper limit to the temperature the human body can withstand — but many people could face ...