Whether a summer day is great or awful often comes down to the humidity.

The monsoon may bring rain, but rising humidity, warmer nights and urban heat are making Indian cities feel hotter than the ...

Most people know that air conditioners dehumidify the air while they make it colder, but are they able to outclass ...

Much of the U.S. is under a blanket of oppressive heat as people prepare for a sweltering July 4th holiday. It’s during times like these that you often hear people talk about the “heat index” when ...

Delhi is expected to remain under the influence of pleasant weather on Tuesday, with the India Meteorological Department (IMD ...

The oppressive air mass will likely linger into Friday, though showers could bring some some relief.

Temperatures are skyrocketing for the third straight day across the Eastern US, but there’s at least three different ways to ...

Today's extreme heat for the World Cup match between Portugal and Croatia is expected exceed world soccer union guidelines ...

What is heat index and how does it affect how stifling excessive heat feels?

This summer, temperatures and humidity have broken records. Here's what research has shown about how our sleep is affected.

Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you can stay safe.