1. An index that combines temperature and humidity to indicate how hot the air feels to the human body; used primarily in Canada and some other countries.
Usage: Canadian English; meteorology; also called 'humidity index'

Examples

• The weather forecast reported a humidex of 35°C, making it feel much hotter than the actual temperature.
• On humid summer days, the humidex can be significantly higher than the thermometer reading.
• Environment Canada uses the humidex to warn the public about dangerous heat conditions.
• The humidex takes into account both the air temperature and the moisture in the air.
• When the humidex reaches 40 or higher, heat-related health risks increase substantially.