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 updated daily. The new data are typically available by 7:00pm (AEST).
** 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
29 Mar 2017 1013.55 1008.10 6.41 4.47 1.05
30 Mar 2017 1011.96 1008.45 -2.87 4.23 0.99
31 Mar 2017 1011.46 1009.25 -9.10 4.08 0.78
1 Apr 2017 1009.95 1008.60 -7.50 3.94 0.42
2 Apr 2017 1009.45 1008.50 -10.38 3.53 -0.10
3 Apr 2017 1010.01 1009.65 -14.64 2.69 -0.59
4 Apr 2017 1011.16 1009.45 -4.90 1.67 -0.90
5 Apr 2017 1010.54 1008.65 -3.61 0.79 -1.06
6 Apr 2017 1010.25 1007.60 1.87 0.70 -1.10
7 Apr 2017 1011.58 1008.55 4.61 0.90 -1.13
8 Apr 2017 1012.80 1009.75 4.76 1.15 -1.24
9 Apr 2017 1012.83 1008.80 11.82 1.95 -1.33
10 Apr 2017 1011.86 1006.80 19.25 3.03 -1.33
11 Apr 2017 1010.11 1005.60 15.28 3.79 -1.26
12 Apr 2017 1009.51 1005.60 10.96 3.97 -1.13
13 Apr 2017 1008.80 1008.65 -16.15 3.22 -1.27
14 Apr 2017 1008.58 1011.00 -34.68 2.08 -1.53
15 Apr 2017 1008.36 1010.75 -34.47 0.90 -1.78
16 Apr 2017 1007.43 1010.00 -35.76 -0.65 -2.14
17 Apr 2017 1007.96 1009.85 -30.86 -2.07 -2.40
18 Apr 2017 1010.65 1010.70 -17.59 -2.95 -2.30
19 Apr 2017 1012.21 1011.25 -10.31 -3.38 -2.05
20 Apr 2017 1011.99 1012.05 -17.67 -4.25 -2.04
21 Apr 2017 1012.83 1011.50 -7.64 -4.87 -1.89
22 Apr 2017 1013.49 1010.85 1.80 -5.03 -1.51
23 Apr 2017 1012.16 1010.25 -3.46 -5.33 -1.29
24 Apr 2017 1011.64 1010.80 -11.18 -6.04 -1.35
25 Apr 2017 1012.45 1010.30 -1.73 -6.39 -1.45
26 Apr 2017 1014.11 1009.70 14.56 -6.10 -1.36
27 Apr 2017 1014.63 1009.65 18.67 -5.48 -1.11

Last updated: 29 June 2010

Southern Oscillation Index (SOI)