Considering that 100F is almost 40C just put your scale from 0-40. It's completely subjective.
0C wear a woolly hat
10C wear a jacket or sweater
20C Teeshirt and jeans weather
30C Teeshirt and shorts weather
40C Get in the shade and keep hydrated
50C You want to avoid this end of the scale
It's almost all defending against the pro-Fahrenheit folks making strange arguments promoting it, like somehow you can't measure your life unless it's in F.
0C wear a woolly hat
10C wear a jacket or sweater
20C Teeshirt and jeans weather
30C Teeshirt and shorts weather
40C Get in the shade and keep hydrated
50C You want to avoid this end of the scale
It's almost all defending against the pro-Fahrenheit folks making strange arguments promoting it, like somehow you can't measure your life unless it's in F.