Humidex

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 // calcul du point de rosée  (formule de Heinrich Gustav Magnus-Tetens)   //
  Temp = Temperature/10;
  Hum = Humidity/10;

  alpha = log(Hum / 100) + (17.27 * Temp) / (237.3 + Temp);
  rosee = (237.3 * alpha) / (17.27 - alpha);


 // calcul de l'indice humidex
  humidex = Temp + 0.5555 * (6.11 * exp(5417.753 * (1 / 273.16 - 1 / (273.15 + rosee))) - 10);

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