(Edit: it changes based on the weather and the time, not based on geolocation.)
Successful strategies tend to get copied.
But generally, you are correct.
Thats my guess for what it is worth :)
How on earth are you supposed to know if 25 °C or 77 °F is going to be sweaty and uncomfortable, if you don't know what the humidity is?
(I live in Tokyo but I guess this would be the same for Australia as well)