Fahrenheit makes more sense for human experience… 0 to 100 roughly corresponds to what can be survived for a significant amount of time. Below freezing you can survive without shelter as long as you’re dressed for it, but as you approach zero it gets a lot harder, you really need shelter and heat at that point. Same with above 100… 117 won’t kill you right away, but without some sort of man-made cooling device, you’ll be wishing it would. I say this having lived both extremes, mountains of Colorado in winter, and Phoenix in summer… Honestly, given the choice between 115 and -15, I’d rather have the cold.