> When you are outside that range, you know you’re in for very uncomfortable weather.

Which is... Pretty random? What is "very uncomfortable"? 'Switch to autumn/spring clothes' uncomfortable (<20ºC)? 'Switch to winter clothes' uncomfortable (≈0ºC)? 'Get a sweater below your winter clothes, and maybe double trousers, too' uncomfortable? (<-20ºC)

Celsius fits the mental model of normal human communication quite well if you use it.

> Celsius doesn’t give much benefit beyond the vague water will freeze around 0.

Which is a very major shift: rain turns into snow, roads get slippery, you should dry your hair extra-carefully (> 0ºC it's raining anyway, you'll get wet anyway, why bother; <0ºC it will turn to ice on your head, you definitely don't want that).

Water freezing is a VERY major weather shift.