|SOI values for ...|
|Average SOI for last 30 days||...|
|Average SOI for last 90 days||...|
|Daily contribution to SOI calculation||...|
|Monthly average SOI values|
Note: The SOI values are expressed as an index (i.e. no units) and are derived from the 1887–1989 base period. This information is updated daily. The new data are typically available by 7:00pm (AEST).
|Date||Tahiti (hPa)||Darwin (hPa)||Daily Contribution||30 day Av. SOI||90 day Av. SOI|
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Tahiti = Barometric pressure in hectopascals (daily reading).
Darwin = Barometric pressure in hectopascals (daily reading).
30 day Av. SOI = Average daily SOI value for the previous 30 days (expressed as an index).
90 day Av. SOI = Average daily SOI value for the previous 90 days (expressed as an index).
Daily values are not the SOI but contribute to the calculation of the 30 day, 90 day and monthly SOI reported here. Daily values presented are useful to observe evolving trends, but are for calculation purposes only. The 30 day (or longer) average SOI values are the key indices for forecast purposes.