[bigger_cheese]

I've lived with deg C my whole life it is what I'm used to, the way I experience weather is in 5 degree increments - I live on East Coast of Australia. My Internal rule of thumb is:

Below 10 deg C - it is cold, Heavy jacket weather

10-15 Typical winter weather (at least where I live) light jacket

15-20 Spring/Autumn weather long sleeves no jacket required

20-25 Pleasant day T-shirt weather

25-30 Getting hot, ceiling fans/AC time

30-35 Hot

35+ very Hot