Re: Why it's important to specify units.
I think he meant that 0-100F covers roughly the Goldilocks zone for humans (-20 to 37.5C), and is thus the "range" for what outside air temperature might be.
It's the idea that if 15C is cool, 20C is warm, and 25C is hot, that's not a good range of numbers to describe the experience as compared to 60, 70 and 80.
Unless I'm doing a SI calculation, I don't care. Plus I hang out with Aussies and African's, so the European idea of a "hot day" is a bit a of a joke.
Biting the hand that feeds IT
