[vhold]

I think of <0F and >100F as being when weather starts becoming lethal if you are poorly prepared.

[lifthrasiir]

People can die from "low" temperature as high as 10 C or 50 F.

[warent]

While we're pointing out extreme outliers out of context to the discussion, water can also remain liquid well below 0c https://en.m.wikipedia.org/wiki/Supercooling