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The humidex ("Hyu-mah-deks") is a temperature index used by Canadian meteorologists to describe how hot the weather feels to a person, by adding the effect of heat and humidity. For example, if the temperature is 30 °C (86 °F) and the calculated humidex is 40, then that means the humid heat feels like a dry temperature of 40 °C (104 °F). The index is widely used in Canadian weather reports during summer to give the discomfort level.