Right now it's -42.4 degrees celcius, or --44.3 degrees fahrenheit in Ottawa.
This the temperature where the celcius and fahrenheit scales break down and we start using the "How fast does toejam freeze."
The first measure on this scale is: "Exposed skin freezes in 5 seconds." This happens at around -50.
It is followed by, "Spit freezes before it hits the ground."
And then my favorite, "PISS freezes before it hits the ground." It very difficult to measure this temperature, because you have to piss with your dick kinda still in your snow suit, because exposed skin is still freezing in 5 seconds.