You can do the same thing with celsius if you live in a country with a different temperature "calendar".

I'm used to the idea that 0C is what splits the year between cold season and warm season. Obviously people from California will see it differently, for example.

So where I live it is like this:

30 or more - hot

15..30 warm

0..15 chilly

-15..0 calendar winter

-30..-15 real winter

..-30 - freezing, kinds younger than 12 don't go to school