A Guide to the humidex, the combined effect of heat and humidity.

Guide to the humidex

The humidex is an index number without units that measures the combined effect of heat and humidity. The humidex number is equivalent to the dry temperature in degrees Celsius that it feels like to someone outside in the heat.

[bmtextbox type="caution" image="0"]What it feels like when the humidex is:

•     30 to 39: Some discomfort.
•     40 to 45: Great discomfort; avoid exertion.
•     Above 45: Dangerous.
•     Above 54: Heat stroke imminent.

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