Climate of Australia?

Does anyone have a recommendation for an area in Australia that would be the greatest to visit? Knowing that most of Australia is arid, what kind of temperatures would you expect to be the maximum and minimum? Around here we experience some high humidity that makes it feel warmer than it actually is, in an arid climate I would expect the humidity to be less? I was really curious about the temperatures and what to expect at certain times of the year. Are there certain times of the year it is best to go visit, and where would be the ideal place to live if you are interested in the wildlife.
Shanna Zubke