The range humans can survive in is roughly 0 to 100 in F, the full range of the scale. The range in Centigrade is roughly -17 to 30

Minor correction:

30°C is a relatively normal temperature for much of the world (not necessarily all the time, but during the hotter parts of the year at least). That’s 86°F. Where I am in Michigan today the high is 32°C.

0°F to 100°F is roughly -18°C to 38°C.

“Thirty is hot, twenty is nice, ten is chilly, zero is ice.”

(I’ve heard this as “ten is cold,” but to me ten isn’t cold, it’s just starting to get chilly. 10°C=50°F, and I wouldn’t call 50°F cold (depending on the season, I guess.)

Off topic, having spent my whole life using Fahrenheit until about six years ago when I decided to test the “Fahrenheit is better for describing weather as it effects humans” reasoning I always used by switching to Celsius on all my devices…I personally much prefer Celsius. It is remarkable how much more meaning I get from -5°C than I ever did from 23°F. Because a degree Celsius is less granular than a degree Fahrenheit, learning the meaning of a degree is much easier. And because the below-freezing temperatures are negative reflections of the above-freezing values, it’s much easier to understand cold temperatures in Celsius (in my opinion).