When I say Australia is hot, I'm comparing it with the UK rather than other places in the world, because that's what most Brits are used to.
If you flipped Australia over, so it was in the Northern Hemisphere, most if would be in Africa (see below).
Of course, the climate isn't the same as Africa because there are so many other variables, like rain and winds and the proximity of the sea, plus the earth's tilt. But it does show that no one should be coming to Australia expecting a climate that is remotely like anything in Europe, even in their summer holiday spots in Spain or Cyprus.
You'll notice that with a couple of exceptions, most of the comparisons on the map are not in Europe.