When I was a kid, I learned about negative numbers pretty early on. It was a perfectly normal part of life, since the temp was in the negative a lot of the year. Made sense to me. Temp is below zero? Water is solid. . Temp above zero? Water is liquid. Fahrenheit doesn’t make much sense to me, inherently, because I don’t have an integral frame of reference, built over decades of familiarity. Celcius on the other hand, it just makes sense!

https://lo.se/english/the_collective_agreement

To me, it clearly seemed to be directed at the mayor.