European here! For me it's...
Celcius:
0 = Water freezes
100 = Water boils
Fahrenheit as far as I can tell:
~100 = Hot enough that it shows up on the news
~400-450 = Cooking, because our stove is in Fahrenheit for some unknown reason.
All other temperatures in F = no idea.
You can think of F as a “% hot” measurement for weather.
0 = no heat: getting dangerously cold for humans. 50 = half hot, half cold: wear long pants and a jacket. 75 = three quarters hot, getting close to t shirt weather. 100= fully hot: getting dangerous for humans.
Yes you can go over or under, but you can consider those to be extreme weather (120% hot!)
75 is only close to tshirt weather?
Acclimatization is a whole thing. I remember thinking 65F / 18C was cold once upon a time, then I moved north and now only bother putting on a jacket if it's below 40F / 5C or so (but now I start seriously suffering above 85F / 30 C where that used to be my ideal temp).
People who pretend certain temps are objectively not that cold or hot have never moved from one climate to another, I think. The person you replied to must be from a hot area.
I spent a week in the Rockies and when I got home, my house at 24°C was just too damn hot I just drank ice water and sat in my underwear.
But what can you do if your area climate includes 110+ F summers and below 0 winters? Besides moving, that is.
70 it hoody and jacket weather for me, so yeah.
This is pretty good! I'll keep this in mind next time I'm in the US.
Sorry but that makes no sense to me.
Is 0% hot no extra heat, like perfect room temp or is it zero heat, the death of all life?
What does 100% hot mean?
You arranged it for yourself to make sense of it, but no need to rationalise it. It's only good, cause you're used to it, or doesn't "feel more human" than Celsius.
I've been in a sauna with 100°C ( what's that? 250°F?) It's doable, but that's probably my personal max. So 100°C air temp is now 100%? Mmmh doesn't really work that great.
All in all, temperature unit is just data points, the interpretation is individual. Fahrenheit is not "more suitable for humans" than any other unit.
Fahrenheit
0 = Well below freezing, about as cold as it gets anywhere that isn't frozen year-round. Dress like you're climbing Everest.
25 = Just below freezing, very cold but not record breaking anywhere people own snow shovels. Bulky jacket and gloves.
50 = Cold to cool, depending on your baseline. Put on a thick sweater or a jacket.
75 = Perfect, slightly above room temperature. T-shirt and shorts.
100 = About as hot as it gets anywhere that isn't a desert. Tank top and sunscreen, and stay in the shade.
Me setting my thermostat to 50 in winter:
The main Fahrenheit I know is -40F.
Mostly because its also -40C.
Why do I care about water boiling when we're talking about weather?
People contain water
If you are regularly encountering weather that is boiling the water in your body, you may want to consider moving to a nicer climate.
Same the other way around. I (european) regularly read about "100 degrees weather" somewhere in the US and my first thought always is "damn, that's as hot as boiling water".
In the UK you think "Oh yeah, my great granny used to use those measurements!"
Here's celcius
Water:
0° - freezes
100° - boils
Me:
10° - freezes
30° - boils
Why can't I be more like water?
0 is freezing (32F)
10 is cold (50F)
20 is nice (68F)
30 is hot (86F)
Canadian here... in spring, 10C is shorts and t-shirt weather, eh?
Toronto is basically due east of where I live. 10C is pretty nice out. Hell, sometimes I don't wear a coat when its 0C
Yeah, if it's not super humid 0C can be pretty ok
Same, but I'm in Scotland. I was out shovelling snow in a vest and leggings and my neighbour who was dressed for an arctic expedition was horrified.
I'm just built for a different climate.
Daytime 10c is shorts and tshirt. Nighttime 10c is shorts and light hoody.
40 is unbearable
50 is death, tar sticks to your shoes, why am I outside?
Well, double dumbass on you!
In Minnesota yes. In Florida no.
I talked with an american so i of course used ammo (9mm) as a scale
Low 30s °C can either be okay or absolutely horrible depending on stuff like humidity, cloud coverage and wind.
Also what you're used to.
Australia? Normal day. Norway? Catastrophic.
Double it and add 32
Cause 30C is warm but 39C is heat stroke. Bigger range than 80-89F (warm to really warm), 90-99F (hot to really hot), 100F+ (heat stroke hot).
In numerics we have decimal points for that :)
We don't even need that for weather. There's not that much of a difference between 21 and 22 C, and anyway with wind and shade you can quickly have a difference of a few degrees.
That's why weather is not just temperature, regardless of the used scale. But to ask you the same, what's the difference between 110°F and 111°F?
Oh no, I agree with you! I don't understand Farenheit at all. I like Celsius because it makes more sense in terms of definition, and having "negatives can have snow, positives can't" is convenient.
I very rarely hear anyone refer to air temperature with a decimal though.