.
This conversion is a bit more complicated than most, since .
You need to use a conversion formula, which is easy to figure out (done here just for fun -- You can just grab the formula out of the book and skip all this if you want, but then your life will be just that much less interesting...)
The formula should be of this form, like a conversion factor with an offset to match up the zero's:
B matches up the zeros, A scales everything to Celsius.
...we know that:
plugging these into the formula to get A and B:
So the formula is: 
Then:
