0 degrees F is a cold winter day, 100 degrees F is a hot summer day

0 degrees C is a cold winter day, 100 degrees C means you're dead

I think he's suggesting that a 0-100 scale for temperature/"relative warmth outside" is more intuitive than a 0-37 scale. It's easier to to place 73 degrees on a 0-100 relative warmth scale than it is to place 18 degrees on a 0-37 scale (unless of course you grew up calibrated to the 0-37 scale and know that 18degrees means you maybe need a light jacket or whatever).

I think it's funny that one of the main benefits of metric is its base-10-ness where things scale so nicely from 1-10-100-1000 etc. but then for temperature we're supposed to be fine with a 0-37? Fahrenheit is basically the 1-100 version of temperature (when it comes to weather).