I went down a huge rabbit hole cause of this. I personally like °F over °C but agree it's arbitrary. So I tried to make a scale that started at the coldest air temp on earth (some day in Antarctica) and went to the hottest day on earth (some day in death valley) and put the coldest day at 0°A and the hottest at 100°A.

Sadly this made a scale that was less precise than I'd like. I like that I can feel the difference between 73°F and 74°F and don't want to have to use decimals.

So maybe the end points could be only places where people actually live. Well it looks like some people live in Russia around -70°C and some people live in northern Africa around 50°C so if you just take °C and add 60 you can get a -10 to 110 scale where most temps would fall between 0 and 100. Still has the unit difference of °C (which I don't like) but I like that most temps are between 0 and 100. I also don't really like negative temperature since it seems wonky.

To "fix" the unit scale you could just multiply everything by 2 so the difference between each full degree is half as much. So temps would be between -20 and 220. °A = 2(°C + 60) °A = 2(°C) + 120

And it turns out I (basically) created the Fahrenheit scale but moved. °F= 1.8(°C) + 32

TL;DR: I'm stupid and this was fun but also a waste of time lol