If you grow up with metric none of these assumptions apply. You learn that 0C is cold, 20C is nice and 40C is hot. At what F do you need to worry about snow? like 30ish? Metric this is 0C so there's usefulness both ways.
Believe it or not, people don't seem to know the ˚F boiling point of water, probably cause it's just not a factor in everyday life. Your kettle whistles when it's boiling.