Long Paddock

Recent (preliminary) Southern Oscillation Index (SOI) values

Tahiti = Barometric pressure (daily reading)
Darwin = Barometric pressure (daily reading)
30 day Av.SOI = Average daily SOI value for the previous 30 days.
90 day Av.SOI = Average daily SOI value for the previous 90 days.

Note: Calculated using the 1887-1989 base period. This information is usually updated every weekday at 2:00pm (AEST), public holidays excluded.
** Daily values are not the SOI but contribute to the calculation of the monthly SOI. Daily values are presented for research purposes only. 30 day (or larger) average SOI values are the key indices for forecast purposes.

If you are looking for data prior to that given below, see SOI data files.

Date Tahiti Darwin Daily** 30 day avg SOI 90 day avg SOI
27 Aug 2016 1017.00 1013.20 13.23 4.30 3.59
28 Aug 2016 1016.31 1013.90 4.79 4.55 3.74
29 Aug 2016 1016.69 1013.10 11.96 4.62 3.82
30 Aug 2016 1017.49 1013.35 15.29 4.42 3.95
31 Aug 2016 1017.35 1013.70 12.32 4.43 4.09
1 Sep 2016 1016.10 1012.40 8.20 4.60 4.22
2 Sep 2016 1015.38 1011.00 12.24 5.14 4.37
3 Sep 2016 1015.51 1010.25 17.47 6.00 4.54
4 Sep 2016 1016.35 1011.75 13.55 6.76 4.90
5 Sep 2016 1016.51 1013.75 2.62 7.08 5.25
6 Sep 2016 1015.98 1013.80 -0.83 7.13 5.29
7 Sep 2016 1015.89 1013.75 -1.07 7.08 5.07
8 Sep 2016 1016.62 1013.10 7.13 7.01 4.95
9 Sep 2016 1016.90 1012.75 10.88 7.00 4.90
10 Sep 2016 1016.11 1011.55 13.31 7.19 5.05
11 Sep 2016 1015.25 1010.85 12.36 7.55 5.20
12 Sep 2016 1016.19 1010.80 18.25 8.21 5.36
13 Sep 2016 1018.80 1011.30 30.78 9.31 5.74
14 Sep 2016 1018.34 1011.40 27.46 10.37 6.08
15 Sep 2016 1017.15 1011.35 20.68 11.16 6.14
16 Sep 2016 1016.48 1011.55 15.51 11.77 6.06
17 Sep 2016 1016.54 1011.15 18.25 12.49 6.10
18 Sep 2016 1015.00 1010.30 14.14 12.75 6.14
19 Sep 2016 1014.13 1009.70 12.54 13.05 6.29
20 Sep 2016 1014.79 1009.85 15.57 13.18 6.53
21 Sep 2016 1015.06 1011.00 10.34 13.06 6.62
22 Sep 2016 1014.75 1011.20 7.31 12.77 6.56
23 Sep 2016 1014.16 1010.65 7.07 12.59 6.44
24 Sep 2016 1013.46 1009.70 8.56 12.61 6.43
25 Sep 2016 1013.98 1008.50 18.78 12.62 6.52

Last updated: 29 June 2010

Southern Oscillation Index (SOI)