Oh bloody hell, bombarded within minutes! Haha, okay... Answered in order of asked:
1. The weather is completely unpredictable here in Australia; we go from having a 12 degree day to having a 40 degree day the next. Our heat is a lot different to yours as well; you can get sunburnt here even when there looks like there's no sun and the weather is cool. Also, the rain is on and off a lot, and over summer (October, November, & December) we tend to get bush fires.
2. As I said just before the weather here is really unprodictable, we do tend to use the sentence "Four seasons in one day" a lot because sometimes, that's the only way to describe it. Where I am personally, it's surrounded by hills and that so it's like we're in the bottom of a bowl, it's really warm here; I know people who wear shorts almost all year round. I still wear things like trackies though but only cause I moved here from an area less nuts with the weather PMS...
3. Cheeseburgers, pizza, hotdogs; their all big fast foods here, but Melbourne is one of the most diverse food capitals in the world, so there's always a great place to eat! A lot of the best restaurants and cafés are found in the little alley ways in the city. We're big on seafood here too, and if your sick of eating, our fashion ain't half bad either; there's always a good place to shop.
4. That's easy, we drive on the left side of the road, and the steering wheel is on the right side of the car.

Anything else? :3