It was reversed after Anders Celcius died
But, if you need to be really pedantic, the standard boiling point of water isn't 100 deg C. It boils at 99.97 deg C at 1 standard atmosphere (101.325kPa) , and at 99.61 deg C at 1 bar (100kPa) which is now taken to be the standard boiling point of water.
This of course fully explains why tea is more lukewarm than it used to be.