The climate of Australia varies widely due to its large geographical size, but by far the largest part of Australia is desert or semi-arid. Only the south-east and south-west corners have a temperate climate and moderately fertile soil. The northern part of the country has a tropical climate, varied between tropical rainforests, grasslands, part desert.
Australia's climate is ruled by the hot, sinking air of the subtropical high pressure belt which moves north and south with the seasons. This causes the rainfall pattern over Australia to be highly seasonal. Australia's rainfall is the lowest of the seven continents (besides Antarctica). Rainfall is variable, with frequent droughts lasting several seasons and is thought to be caused in part by the El Niño-Southern Oscillation.
Since it is a small continent separated from polar regions by the Southern Ocean, Australia does not get the harsh snaps of polar air that swarm over Northern Hemisphere continents during winter. The continents in the Northern Hemisphere have a considerable temperature contrast between summer and winter, whereas in Australia the temperature contrast is small. In many parts of the country, seasonal high and lows can be great with temperatures ranging from above 50 °C (122 °F) to well below zero. Minimum temperatures are moderated by the lack of mountains and the influence of surrounding oceans.
The El Niño-Southern Oscillation is associated to seasonal abnormality in many areas in the world, though Australia is one of the most affected continents, which experiences extensive droughts alongside with considerable wet periods. Occasionally a dust storm will blanket a region and there are reports of the occasional tornado. Tropical cyclones, heat waves, bushfires and frosts in the country are also associated to the Southern Oscillation. Rising levels of salinity and desertification in some areas is ravaging the landscape.
According to the Bureau of Meteorology, 80% of the land have a rainfall less than 600 mm (24 in) per year and 50% having even less than 300 mm (12 in). As a whole, Australia has an annual average rainfall of 419 mm (16 in).
Read more about Climate Of Australia: Paleoclimate
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