Dear Vincent, 

have you ever saw Tourism climatic index of Mieczkowski (1985)? Methodology is shown in his paper: Mieczkowski, Z. (1985)? The Tourism Climatic Index: A Method of Evaluating World Climates for Tourism. The Canadian Geographer/Le Géographe canadien, 29(3), 220-233. 

I've sent you another similar work in attachment. 

Best regards! 

While there are some wind chill calculators out there that allow you to type in values above 10 °C, I don't know of any official formula. For example, http://www.onlineconversion.com/windchill.htm will cough up some numbers. I would definitely look into why the wind chill index was only defined for

Dear Vincent Moron

The most simple and enough  accurate Index you need was developped by Baruch Givoni "The Index of Thermal Stress" ITS  # 5.6 and #16.1,c (The building Bioclimatic Chart).

.See in his book "Man Climate and Architecture" Applied Science Publishers - London 1976 Reprinted 1901

Take into account that certainly you must consider that no "acceptable discomfort" will you found under the sun, but in the shade properly dressed. Then the formulation is much simple if direct solar radiation is not considered.

Then you need to evaluate which is the acceptable E/Emax value you need according to the sweat rate Inex of humidity. Certainly no Comfort will be found at 37 degC, But you can define the (also) acceptable low metabolic rate...

If you are interested in the way I use it, please write to my email  

Milo E.  Hoffman you will be welcomed 

My email address is:

Milo E. Hoffman you will be welcomed

As I wrote above if you don't write to me to my email I will consider that you desisted..

The environmental conditions you exposed were taken into account in the design in hot humid and hot arid zones with mean Tmax 37 degC and above. 

 Above Givoni' s Book was reprinted in 1981.