Fortunately the insanity of "standard" units has everyone used to memorizing silly facts like boiling is 212 and there are 5280 feet in a mile.
If you're used to that, it's easy to remember that C = (F-32) * 9 / 5.
If you're used to that, it's easy to remember that C = (F-32) * 9 / 5.
Using a random human’s body temperature and a strange random mixture of chemicals as scale points does not make any sense. Might as well pick a random hot day and a random cold day and use that.