Summer in Australia falls between the months of December and February. It brings sunny, warm days that are best spent at one of the country’s gorgeous beaches. The tropical north is in the midst of its wet season (November to April), which brings heavy rains and tropical storms to Darwin, Broome, Cairns and the Whitsundays.
https://www.australia.com/en/facts-and-planning/when-to-go/australias-seasons.html