Isn't this about an increase of 20 degrees C (68F), not an actual temperature of 20C?
Edit (thanks redewenur): an increase of 20C would be an increase of 39 degrees F, not 68.
20 C is 68 F
Im really surprised that you and red didnt know that.
a simple google search would have shown you.
Simple google searches can make us think too simple.
It's a common mistake, as I demonstrated; but from your view, then an increase of 0 degrees C would be the same as an increase in 32 degrees F, or a
decrease of 10 degrees C would be an increase of 12 degrees F.
Just look at your graphic. Going from 0C to 20C (an increase of 20 degrees) moves one from 32 to 68 degrees F., so that would be an increase of 36 degrees.
One degree F = 9/5 degree C;
so 20C (9/5) = 36F... (whoops, not 39 degrees; but not 68 either).
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