100 is too hot to be outside for more than a few minutes, and it's around the hottest you can expect it to get during a year in most regions, with few exceptions.
0 is too cold to be outside more than a few minutes, no matter how many layers you put on. It's also about the coldest you can reasonably expect it to get during a year.
80 is 80% hot, and so on.
On your home thermostat, there's a slighter difference between a single degree higher or lower. In Celsius a single degree is almost two whole degrees in Fahrenheit, so F is much more granular.
Normal human body temperature is 98.6. So if it's over 100, it might be something to worry about.
If I were to steel man the Celsius scale, I'd say:
At 0 you can expect snow and ice on the roads.
You set your refrigerator and freezer temperatures to just above and below 0, respectively.
Reasons Fahrenheit is better:
If I were to steel man the Celsius scale, I'd say: