@Kyou Most USAians are, considering that they cannot get it through their minds that they are using Celsius with extra steps;
You have: tempF
Definition: tempF(x) = (x+(-32)) degF + stdtemp
defined for x >= -459.67
You have: degF
You want:
Definition: 5|9 degC = 0.55555556 K

It would be far more logical to directly use Celsius with an offset of human body temperature to make say 0°Z the average human body temperature if they are obsessed with such bizarre requirement, but of course not.