Similar to the British, Aussies have evolved a sense of humour which invokes a lot of "taking the piss" (making fun of). We do it to ourselves as much as we do it to others, but it is meant to be light-hearted. You will truly know if we are serious!
Weather is more unpredictable in Adelaide. Melbourne is generally more cold & rainy than Adelaide, where Adelaide is legit all over the place. 1 day it's raining and freezing, next day it's warm and sunny.
The weather on the southern coast of Australia is heavily involved with the Antarctic effect. The changes from hot to cold are often dramatic. The southerlies are strong, there's is only open ocean between the two continents, much of this water is cold. Melbourne gets the publicity, but it is the full width of Australia. Locals understand the climate and will carry warm clothing on hot days. But it is not only the coast as these southerlies can reach 200 km (or further) inland.
This time we only did the East-cost But looking forward to do the west-coast one day as well 😜 But we have to save up to could afford a Camper-van for this trip 💯