Holy hell the current 14 day forecast for Las Vegas does not dip below 40, and I believe it has been going like this for a while before now too. Bunch of 44's in there. Could you imagine the Melbourne power grid meltdown?
Ouch. Vietnam was in that range when I first went there, I was drinking a ton and still got deyhydrated because my body just couldn't absorb the water fast enough. It's also an extra shock when you travel from a Melbourne winter. I assume the Las Vegas dry heat would feel different than the humid heat, but it's definitely way too hot for comfort.