In the southern half of Australia the seasons are usually the opposite of those in the northern hemisphere: spring comes in September, summer is from December to February, autumn runs from March to May, and winter begins in June. In contrast, the tropical climate of the north coast is more clearly divided into a wet season from November to April and a dry season - possibly the best time to travel - from May to September.
The Northern Territory’s Top End has a distinct wet season between December and March, and although this can be spectacular the build up to the rains can be uncomfortably humid.
Central Australia, which has little heavy rain at any time of year, is hottest from November to February and at its best between March and May, when days are warm and evenings cool.