Heat, Humidity and Heat Index

Heat and Humidity are the two factors that determine how warm we feel.

Heat is the actual temperature, while Humidity is the amount of water vapor in the air.

Humidity magnifies the heat that we feel. This is because the higher the humidity, the slower our sweat evaporates, thereby reducing our bodies’ natural cooling ability.

The combination of Heat and Humidity is the Heat Index, which is how cool or warm we feel. As can be seen in the Heat Index Table below, the higher the Humidity at any given temperature, the warmer we feel.

PH Heat Index Table


The table below shows how the Heat Index affects the human body.

Effects of Heat Index



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