Yup, that’s one of my favorite things about the Fahrenheit scale: it’s a good approximation of “on a scale of 1-100, how cold/hot is it outside?” where a broad range of human climates would agree on the answer.

0F is pretty dang cold out, and 100 is pretty dang hot out. Sure, there are temperatures in human habitats outside that range, but most people would consider then “extreme” temperatures, hence values less than zero, or greater than 100.