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Comic strip of a ghost and a person with the American flag pasted on the head. The ghost repeats "Boo!" in the first three panels without getting any reaction, but when it in the fourth panel says "kg, cm, km, °C" the American gets scared and screams "AHHHH!!!".
Edit: fixed alt text
100°C is an acceptable sauna temperature. You won't last much longer naked in 0°C!
Edit: To make my point more clear, I know some crazy people who go directly from a close to 100 degree sauna to a close to 0 degree ice bath. I think that could be described quite well as going from 100 to 0 % within the human temperature tolerance.
Also, that's not my initial point. My initial point was that "percent hot outside" means nothing in Fahrenheit or Celsius.
(whoops, pressed delete instead of edit)