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
17 Mar 2015 1005.66 1009.05 -35.90 -4.36 -7.12
18 Mar 2015 1008.13 1008.65 -22.10 -5.17 -7.39
19 Mar 2015 1010.35 1009.55 -15.80 -6.02 -7.43
20 Mar 2015 1008.79 1011.20 -31.20 -7.64 -7.59
21 Mar 2015 1010.78 1010.60 -18.80 -8.81 -7.63
22 Mar 2015 1012.16 1009.45 -6.70 -9.84 -7.48
23 Mar 2015 1012.57 1008.70 -1.10 -10.71 -7.08
24 Mar 2015 1012.75 1007.85 3.70 -10.94 -6.61
25 Mar 2015 1013.26 1008.90 1.20 -10.59 -6.40
26 Mar 2015 1014.26 1009.60 2.60 -10.04 -6.36
27 Mar 2015 1013.54 1012.45 -14.40 -9.80 -6.55
28 Mar 2015 1012.66 1012.15 -17.20 -9.95 -6.73
29 Mar 2015 1012.86 1011.70 -14.10 -10.35 -6.85
30 Mar 2015 1013.89 1011.55 -8.40 -10.73 -6.82
31 Mar 2015 1014.02 1011.75 -8.80 -11.29 -6.80
1 Apr 2015 1013.90 1010.85 4.70 -11.32 -6.70
2 Apr 2015 1013.56 1009.30 13.40 -11.12 -6.58
3 Apr 2015 1010.79 1008.15 1.80 -11.21 -6.57
4 Apr 2015 1010.94 1008.50 0.30 -11.07 -6.56
5 Apr 2015 1012.01 1008.55 7.70 -10.72 -6.45
6 Apr 2015 1012.04 1008.50 8.20 -10.25 -6.40
7 Apr 2015 1010.08 1008.10 -2.90 -9.60 -6.48
8 Apr 2015 1008.27 1010.20 -31.10 -9.90 -6.78
9 Apr 2015 1010.44 1010.80 -19.80 -9.99 -6.95
10 Apr 2015 1012.16 1010.45 -4.90 -9.60 -7.07
11 Apr 2015 1012.90 1010.30 1.50 -9.02 -7.06
12 Apr 2015 1013.42 1010.75 2.00 -8.68 -7.04
13 Apr 2015 1013.48 1010.85 1.70 -8.40 -7.07
14 Apr 2015 1014.15 1010.90 6.20 -7.78 -7.04
15 Apr 2015 1015.12 1011.90 5.90 -6.41 -7.06

Last updated: 29 June 2010

Southern Oscillation Index (SOI)