All natural extremes fit within +100 and -100 beautifully.

110 - sauna is too hot

100 - water boils in one atmosphere

50 - desert hot (record is 56.7 °C (134.1 °F) Death Valley, California, U.S.A. 10 July 1913)

30 - hot (for a finn)

25 - nice hot

20 - use more clothes below this

0 - water freezes, ice forms on roads, lakes etc.

-10 - cold but OK with good clothes

-20 - this starts to be so cold were you need to prepare yourself well if you want to spend more than an hour outside. Temperature inside freezer.

-30 - extreme colds start. You don't enjoy this even when prepared and using good clothes.

-40 - Winter War conditions

-50 - record breaking extremes

−89.2 °C (−128.6 °F) Vostok Station 21 July 1983

-110 Kriotherapy room for treating joint inflammation

F was designed for humans, while C is apparently designed for water. Half of your list talks about what water does, or are fairly meaningless numbers to humans. While pretty much every number on the GPs list is relevant to humans. That is the big difference. In day to day life, the average human doesn't really need to know what temp water changes state. They want to know how comfortable they will be.

I take it that you never tasted a cucumber partly frozen because your fridge went a bit overzealous...

We (and most things we eat, and all that white shitty stuff that blocks your commute in a winter day) are made mostly of water. The difference between -1C and 1C can be pretty significant, unlike the difference between -1F (fucking cold) and 1F (duh, fucking cold).

* Well, of course all of this is silly pissing match between groups of people who grew up with their favorite measure system, but anyway...

Humans are 80% Water.

This pretty good. I'd put in 40, so hot you forget it gets this hot (for northern europeans).

i should move to northern europe :\

40 (as a max) was a not overly bad summer day

For the British:

100 - Boiling water, cuppa tea

50 - Lawrence of Arabia

25 - The Great British Summer! Won't last, anyway

12.5 - Wear a jumper

6.25 - Wear a parka

0 - water freezes

-6.25 - Heathrow shuts down

-12.5 - Daily Mail reports weather causes cancer

-25 - Coldest reported weather in the UK

-50 - "I am just going outside and may be some time"

Well, I think it's just the same as you except 0 is the freezing point and not what seems like an an arbitrary 32 Farenheit for us.

Hmm, I just learned that below 10 degrees C it's cold, 20 is ok and 30 is hot. 0 is water freezing, 100 is water boiling.

Maybe I'm missing out on something but I never felt the need for a chart.