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Southern Oscillation Index

The Southern Oscillation Index (SOI) is calculated from the monthly or seasonal fluctuations in the air pressure difference between Tahiti and Darwin.

A strongly and consistently positive SOI pattern (e.g. consistently above about +6 over a two month period) is related to a high probability of above the long-term average (median) rainfall for many areas of Australia, especially areas of eastern Australia (including northern Tasmania) - La Niña.

Conversely, a 'deep' and consistently negative SOI pattern (less than about minus 6 over a two month period, with little change over that period) is related to a high probability of below median rainfall for many areas of Australia at certain times of the year - El Niño.

However, it is important to remember that the pattern of relationship between SOI and rainfall (and temperature) can vary depending on the particular season and region. Additionally, the change in SOI over a specified period can be as important in understanding relationships between SOI and rainfall as is the absolute value in SOI.

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Shoalhaven oyster farmers face hundreds of thousands of dollars in losses as floods wash away salinity

16:30 EST

Oyster farms flooded in this week's downpour at Greenwell Point on the New South Wales south coast could lose hundreds of thousands of dollars' worth of oysters.

Weather bureau's outlook predicts wetter than average spring in western and central Australia

15:47 EST

The Bureau of Meteorology says spring could be wetter than normal for much of western and central Australia.

Southerlies soak parts of VIC

13:38 EST

A moisture laden southerly flow directed by an East Coast Low interacted with an upper cold pool over parts of Victoria yesterday producing persistent and heavy showers.