What is "humidex"

n. (context Canada meteorology English) A measurement used by Canadian meteorologists to reflect the combined effect of heat and humidity, as the apparent temperature felt by a person.

The humidex (short for humidity index) is an index number used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity. The humidex is a dimensionless quantity based on the dew point.

According to the Meteorological Service of Canada, a humidex of at least 30 causes "some discomfort", at least 40 causes "great discomfort" and above 45 is "dangerous", with heat stroke possible.