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Australia is in the southern hemisphere, so the seasons are reversed. It's winter Down Under during the American summer.
The ideal time to visit the north, particularly the Northern Territory's Kakadu National Park, is early in the dry season (around May). Birdlife remains profuse on the drying floodplains, and waterfalls are still spectacular and accessible. The Dry (April–October) is also a good time to visit northern Queensland's beaches and rain forests. You can swim off the coast without fear of dangerous stinging box jellyfish, which infest ocean waters between November and March. In rain forests, 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 U.S. and British summer break.
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. From September through November (the Australian spring), or from February through April (late summer–autumn), 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.