Australia lies in the southern hemisphere, so the seasons are reversed. It’s winter Down Under during the American summer.
Australia’s climate is temperate in southern states, such as Victoria and Tasmania, particularly in coastal areas, and tropical in Australia’s far north. The Australian summer north of the Tropic of Capricorn is a steam bath.
The best time to visit the southern states is from September to November (the Australian spring), or from February to April (late summer-autumn), when the southern regions are generally sunny and warm, with only occasional rain in Sydney, Melbourne and Adelaide. Perth and the south of Western Australia are at their finest in springtime, when wildflowers blanket the land.
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The ideal time to visit the north, particular the Northern Territory’s Kakadu National Park, is early in the dry season (around May). Birdlife remains prolific on the drying floodplains, and waterfalls are still spectacular and accessible. The Dry (April to October) is also a good time to visit northern Queensland’s beaches and rainforests. You can swim off the coast without fear of dangerous stinging box jellyfish, which infest ocean waters between November and March. In rainforests, heat and humidity are lower than later in the year, and crocodile viewing is at its prime.
During school holidays, Australians take to the roads in droves. The busiest period is mid-December to the end of January, which is the equivalent of the US and British summer break.