When I lived in °C places I had to pay attention to single-digit
differences like 24 °C versus 29 °C, wasting the first digit.
[...]
In Fahrenheit I get the basic idea with the first digit.
“It’s in the thirties” = multiple layers and coat.
“It’s in the nineties” = T shirt weather.
In the 70’s and 80’s I want a second sig-fig but I don’t even need 10
elements of precision. Just “upper 70’s” is enough. The first °F digit
gives you ballpark, and the second °F digit gives you even more
precision than you need.
I do think it’s a difference between whether my flat is heated at 20 C or 22 C.
The range between 0 and 100 might map the weather better but there’s a lot of temperature that I care about that’s not weather. If I drink tea the second digit doesn’t matter. There are water cookers that provide either 60, 70, 80, 90 or 100 degrees and that maps well to real world differences.
—http://isomorphism.es/post/3767526267/fahrenheit-versus-celsius
I do think it’s a difference between whether my flat is heated at 20 C or 22 C.
The range between 0 and 100 might map the weather better but there’s a lot of temperature that I care about that’s not weather. If I drink tea the second digit doesn’t matter. There are water cookers that provide either 60, 70, 80, 90 or 100 degrees and that maps well to real world differences.