Sunrise at 7:00 AM, sunset at 4:45 PM. You lose about 4 hours of daylight compared to December. If you are a photographer or hiker, your window is tight.
You cannot visit Darwin or Kakadu in summer (it’s too hot and wet). Winter is the dry season up north. Humidity drops, temps sit at a glorious 31°C (88°F), and the waterfalls are still flowing. If you want tropical weather without melting, June–August is the only time to go. australia winter months
The Snowy Mountains (Thredbo/Perisher) are not the Alps, but they are fun. It’s expensive, and the snow can be slushy, but where else can you ski in the morning and drink wine in a valley that looks like Tuscany in the afternoon? Sunrise at 7:00 AM, sunset at 4:45 PM