I like your reference point. We have fahrenheit, celsius / centigrade (I can never remember the difference) and kelvin. But for a handy orienteering-hypothermia quick check, we now have colder than / warmer than IOC. Please dress appropriately.
Ha! Pulled that one here a couple of weeks ago. Gales, mist, rain, open hillside. Everyone else was complaining, but compared with IOC it was very comfortable.