Humidex is a bioclimatic index developed by the Canadian weather service combining air temperature and dew point to indicate how the human body perceives heat. Unlike the US heat index, it uses dew point directly.
Danger thresholds
Values of 30–39: some discomfort. 40–45: considerable discomfort, avoid exertion. >45: dangerous, risk of heatstroke. >54: imminent danger of death. Humidex can exceed 50 in south-east Spain during heat waves with maritime humidity.