Available data on the “Heat Index” indicator

Hello,

As part of a study linking climate change adaptation and sports, I am particularly interested in the “Heat Index”, which combines air temperature and relative humidity to determine perceived thermal stress. Indeed, for humans, a heat index above 33 °C combined with relative humidity above 40% makes strenuous physical activity dangerous to health.

Could you please advise me on where I could find this indicator, ideally expressed as the number of days per year, projected under different climate scenarios and time horizons, and at a global scale?

Thank you very much in advance for your valuable assistance.

Kind regards,
Jérémie SENUT