Any time is a good time to be in Australia. Summer (December-February) can get uncomfortably hot just about anywhere, except Tasmania. Up north, this is the wet season, where it's very humid and the sea will be swarming with box jellyfish. On the upside, the Top End is beautifully green and free of tourists at this time.
From June until August things have cooled down a little and dried up a lot up north. This is a good time to visit Queensland or the outback. If you're here for the skiing, now's the time to head for the snowfields of Victoria and NSW.
Overall, spring and autumn are probably the safest bets - the weather is reasonably mild wherever you are, and spring brings out the wildflowers in the outback, while autumn is particularly beautiful in Canberra and in the Victorian Alps. If you want to avoid holiday road chaos, don't arrive in Australia at Easter.
Don’t miss the following:
Australia's premier city is the oldest settlement in Australia. In February 1999, "Travel and Leisure" magazine named Sydney "the best value city in the world" for the third straight year.
Australia's second city is a place of contradictions and hidden charms. Visitors come for its shopping, restaurants, nightlife and sporting calendar.
Perth, the capital of Western Australia, is a vibrant and modern city pleasantly sited on the Swan and Canning rivers, with the cerulean Indian Ocean to the west and the ancient Darling Ranges to the east.
Great Barrier Reef
The Reef and Rainforest Coast is an international showcase of natural beauty, world-class resorts and tourist attractions. Home to the vibrant coastal town of Port Douglas, the green surrounds of Mossman and the lush wilderness of the Daintree region, the Reef and Rainforest Coast embraces some of Australia's most wonderful natural and man-made attractions
Uluru is a site of deep cultural significance to the local Anangu Aboriginals and the most famous icon of the Australian outback. A pilgrimage to Uluru and the coronary-inducing scramble to the top was an entrenched Australian ritual. The 3.6km (2.2mi) long rock rises a towering 348m (1141ft) from the pancake-flat surrounding scrub, smack in the middle of the country, and is especially impressive at dawn and sunset when the red rock spectacularly changes hue. There are walks around the base of the rock which pass caves, rock art and sacred Aboriginal sites. Nearby Kata Tjuta (the Olgas), 32km (20mi) west of Uluru, are equally impressive monoliths and Mt Olga is actually much higher than Uluru. The Valley of the Winds is a worthy 6km (4mi) circuit.
Great Ocean Road
This route along the southwestern coast of Victoria is one of the most spectacular coastal drives in the world.
The rugged Kimberley at the northern end of Western Australia is one of Australia's last frontiers. It's a little-travelled and very remote area of great rivers and magnificent scenery.
Although its renowned as a winter playground, the park is also popular with bushwalkers in summer, when there are marvellous alpine wildflowers.