80
40 rule
(sh.itjust.works)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Either a bit above freezing, or a bit above human body temperature.
At least it couldn't be Kelvin. Kelvin doesn't use degrees.
I assure you, the last thing I'll be thinking on a 40 degree day is "this is practically human body temperature!"
It's more like: "The air is so hot that sweating is basically useless!"