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Return to The Current SeasonS.O.I. (Southern Oscillation Index) Archives
- 1876 to present

An explanation of the SOI is available here.
A plain text version of this table is available here.
Plain text Darwin and Tahiti monthly MSLP time series are also available.
Based on means and standard deviations calculated over the period 1933 to 1992 inclusive.
YearJanFebMarAprMayJunJulAugSepOctNovDec
187611.311.00.2 9.46.817.2-5.612.310.5-8.0-2.7-3.0
1877-9.7-6.5-4.7 -9.63.6-16.8-10.2-8.2-17.2-16.0-12.6-12.6
1878-8.7-21.1-15.5 -8.82.1-3.115.913.017.710.915.117.9
187912.714.313.2 12.72.116.421.822.618.915.29.8-5.5
YearJanFebMarAprMayJunJulAugSepOctNovDec
188010.87.714.3 5.312.39.11.614.38.14.87.2-1.9
1881-7.3-5.51.8 0.3-4.3-4.7-5.6-11.4-13.6-23.97.29.8
1882-6.8-1.35.1 1.26.8-12.0-21.3-25.6-14.8-2.52.610.3
18836.09.1-25.3 14.413.93.4-10.21.4-8.24.85.2-15.2
1884-12.5-5.09.4 -15.41.39.1-3.0-5.0-7.04.2-1.4-12.6
1885-16.31.65.1 -0.5-4.3-14.4-5.0-9.5-4.0-17.8-15.95.2
1886-0.61.62.9 4.56.05.07.413.613.513.410.514.4
188712.211.010.0 9.4-4.35.04.84.65.14.8-5.35.2
1888-3.0-2.2-11.7 -23.6-9.8-16.0-16.7-8.9-9.4-14.7-12.6-2.4
1889-25.9-1.7-27.5 -0.5-1.922.01.62.111.14.223.022.0
YearJanFebMarAprMayJunJulAugSepOctNovDec
189020.811.014.3 6.93.65.8-2.3-3.19.33.62.60.6
189115.6-3.6-9.5 4.5-0.3-1.5-6.3-8.9-10.60.6-4.7-4.5
18922.7-10.211.1 6.910.019.67.45.96.38.5-0.73.7
189311.37.7-1.4 1.2-3.510.714.07.85.77.92.61.6
189417.510.05.6 -3.0-5.1-1.5-2.3-5.7-1.61.87.20.1
18955.63.0-0.3 -7.1-8.2-4.7-0.4-6.3-4.0-5.6-8.6-3.5
18961.34.9-6.3 -8.8-42.2-30.6-20.6-22.4-19.0-19.0-11.9-14.2
1897-12.5-7.4-16.6 -17.8-16.90.2-2.30.80.21.8-8.010.3
18987.06.319.2 11.1-1.9-2.36.12.13.2-0.7-2.7-0.4
189913.29.113.8 4.5-7.4-10.4-5.6-10.1-1.66.115.8-3.0
YearJanFebMarAprMayJunJulAugSepOctNovDec
1900-7.3-6.5-25.3 -18.7-7.426.110.07.8-16.6-17.2-6.0-5.5
1901-0.13.09.4 4.5-0.319.614.69.8-16.0-22.1-8.6-1.9
190217.0-2.211.6 7.87.62.61.6-8.9-17.8-7.4-3.4-3.0
1903-9.2-10.217.6 17.77.6-0.66.10.18.74.21.315.9
190414.116.29.4 31.79.2-7.1-8.90.80.21.2-17.22.6
1905-9.2-16.8-30.2 -42.6-37.4-31.4-21.3-7.6-7.0-5.6-17.9-13.1
1906-3.5-7.4-5.2 -8.81.3-3.96.815.518.39.121.74.7
19075.11.6-0.3 4.510.08.3-4.3-8.20.20.6-2.08.8
1908-10.67.70.2 16.8-1.1-2.32.25.317.77.92.6-5.5
1909-2.5-3.2-0.3 -14.52.122.810.79.80.84.29.24.7
YearJanFebMarAprMayJunJulAugSepOctNovDec
19105.615.212.7 5.30.522.020.59.815.310.319.715.9
19113.21.63.5 2.0-8.2-12.0-12.8-12.1-8.8-11.7-7.3-1.4
1912-9.7-17.3-9.0 -21.1-13.0-6.3-0.4-7.6-4.0-8.02.6-8.0
1913-3.5-5.01.3 -6.3-8.2-3.9-1.7-7.6-9.4-9.2-11.9-7.0
1914-5.42.09.4 -14.5-0.3-16.8-18.0-17.2-12.4-8.6-11.9-1.4
1915-21.6-2.2-20.4 -17.8-12.26.614.07.27.52.4-14.69.8
19165.6-3.6-6.3 -0.56.89.125.716.24.56.19.815.4
19175.110.018.1 21.821.821.228.334.829.715.221.022.5
191814.616.6-2.0 16.810.0-4.7-14.1-4.4-8.2-5.01.3-8.0
1919-14.9-11.2-12.8 -3.0-7.4-10.4-8.9-6.9-5.8-10.5-11.3-9.1
YearJanFebMarAprMayJunJulAugSepOctNovDec
19201.8-1.7-4.1 0.3-2.76.69.45.35.1-4.3-0.19.8
192110.86.78.9 -7.12.122.02.9-6.95.19.78.58.2
19228.09.15.6 -5.5-5.15.82.2-1.25.16.18.511.8
19235.64.48.9 8.62.11.0-11.5-18.5-14.8-6.2-12.62.1
1924-5.41.12.4 -15.411.58.37.410.48.17.911.85.2
19255.613.814.9 14.4-1.1-4.7-13.4-10.8-6.4-12.9-9.3-7.0
1926-5.4-14.5-13.3 -7.1-2.7-7.1-1.0-7.61.44.21.36.2
19275.11.118.1 6.96.08.36.1-5.0-0.4-4.3-8.07.7
1928-10.110.513.8 11.9-2.7-7.9-0.49.88.19.12.611.8
192916.018.05.1 4.5-12.21.01.60.1-0.47.911.15.7
YearJanFebMarAprMayJunJulAugSepOctNovDec
193012.77.71.8 -3.82.1-5.5-4.3-1.8-7.03.61.9-1.4
19317.0-14.95.6 8.613.118.89.40.15.1-12.9-4.74.7
19321.8-3.6-2.5 -2.12.8-4.7-5.0-6.9-8.8-4.3-4.73.2
1933-11.14.9-2.0 3.66.0-3.93.5-0.52.03.67.28.2
19346.50.10.2 6.1-7.410.72.9-22.4-6.44.213.1-2.4
19356.5-4.612.2 2.8-6.6-2.3-0.42.16.37.33.9-4.0
1936-2.00.61.8 22.64.4-1.54.2-8.92.6-0.1-13.90.6
19379.4-5.06.2 2.0-0.33.4-5.63.30.8-2.5-2.06.7
19387.53.4-3.6 3.613.118.018.513.07.512.81.913.8
193917.07.711.6 9.4-1.1-1.58.1-0.5-9.4-14.7-8.0-8.6
YearJanFebMarAprMayJunJulAugSepOctNovDec
1940-0.1-4.1-10.6 -9.6-14.5-19.3-15.4-18.5-19.6-18.4-6.7-29.4
1941-9.7-15.4-10.6 -11.2-6.6-14.4-20.6-19.1-8.2-20.2-9.3-8.6
1942-13.0-3.6-5.8 -5.55.28.3-1.04.08.78.5-4.013.8
19439.410.54.0 13.52.8-7.92.97.85.79.13.9-8.6
1944-8.23.95.6 -5.5-1.1-3.9-8.93.32.6-8.6-6.74.2
19455.16.313.2 -7.1-0.38.33.511.78.72.4-3.46.7
1946-2.54.4-2.0 -9.6-11.4-9.6-10.2-4.4-16.0-12.3-1.4-5.5
1947-4.9-4.111.6 -4.6-13.72.69.47.211.7-1.99.25.2
1948-3.0-2.7-4.1 2.83.6-4.70.9-4.4-7.66.14.6-5.5
1949-7.32.05.6 1.2-5.8-12.0-1.7-4.42.05.4-6.07.7
YearJanFebMarAprMayJunJulAugSepOctNovDec
19505.117.617.6 16.87.626.921.112.36.917.112.523.0
195116.59.6-1.4 -1.3-6.65.0-8.2-0.5-7.0-8.0-3.4-3.0
1952-9.2-7.90.2 -8.86.07.43.5-3.7-3.41.8-0.7-12.6
19532.2-6.0-5.8 -0.5-31.9-2.3-1.0-17.2-13.0-0.1-2.0-4.0
19546.0-3.6-0.9 6.94.4-1.54.210.44.51.83.912.8
1955-5.415.22.9 -3.013.116.419.214.914.115.215.19.3
195611.312.49.4 11.117.912.312.611.00.218.31.910.3
19575.6-2.2-0.9 1.2-12.2-2.30.9-9.5-10.6-1.3-11.9-3.5
1958-16.8-6.9-1.4 1.2-8.20.22.27.8-3.4-1.9-4.7-6.5
1959-8.7-14.08.4 3.62.8-6.3-5.0-5.00.24.211.18.2
YearJanFebMarAprMayJunJulAugSepOctNovDec
19600.3-2.25.6 7.85.2-2.34.86.66.9-0.77.26.7
1961-2.56.3-20.9 9.41.3-3.12.20.10.8-5.07.213.8
196217.05.3-1.4 1.212.35.0-0.44.65.110.35.20.6
19639.43.07.3 6.12.8-9.6-1.0-2.4-5.2-12.9-9.3-11.6
1964-4.0-0.38.4 13.52.87.46.814.314.112.82.6-3.0
1965-4.01.62.9 -12.9-0.3-12.8-22.6-11.4-14.2-11.1-17.91.6
1966-12.0-4.1-13.9 -7.1-9.01.0-1.04.0-2.2-2.5-0.1-4.0
196714.612.97.8 -3.0-3.56.61.65.95.1-0.1-4.0-5.5
19684.19.6-3.0 -3.014.712.37.40.1-2.8-1.9-3.42.1
1969-13.5-6.91.8 -8.8-6.6-0.6-6.9-4.4-10.6-11.7-0.13.7
YearJanFebMarAprMayJunJulAugSepOctNovDec
1970-10.1-10.71.8 -4.62.19.9-5.64.012.910.319.717.4
19712.715.719.2 22.69.22.61.614.915.917.77.22.1
19723.78.22.4 -5.5-16.1-12.0-18.6-8.9-14.8-11.1-3.4-12.1
1973-3.0-13.50.8 -2.12.812.36.112.313.59.731.616.9
197420.816.220.3 11.110.72.612.06.612.38.5-1.4-0.9
1975-4.95.311.6 14.46.015.521.120.722.517.713.819.5
197611.812.913.2 1.22.10.2-12.8-12.1-13.03.09.8-3.0
1977-4.07.7-9.5 -9.6-11.4-17.7-14.7-12.1-9.4-12.9-14.6-10.6
1978-3.0-24.4-5.8 -7.916.35.86.11.40.8-6.2-2.0-0.9
1979-4.06.7-3.0 -5.53.65.8-8.2-5.01.4-2.5-4.7-7.5
YearJanFebMarAprMayJunJulAugSepOctNovDec
19803.21.1-8.5 -12.9-3.5-4.7-1.71.4-5.2-1.9-3.4-0.9
19812.7-3.2-16.6 -5.57.611.59.45.97.5-5.02.64.7
19829.40.62.4 -3.8-8.2-20.1-19.3-23.6-21.4-20.2-31.1-21.3
1983-30.6-33.3-28.0 -17.06.0-3.1-7.60.19.94.2-0.70.1
19841.35.8-5.8 2.0-0.3-8.72.22.72.0-5.03.9-1.4
1985-3.56.7-2.0 14.42.8-9.6-2.38.50.2-5.6-1.42.1
19868.0-10.70.8 1.2-6.610.72.2-7.6-5.26.1-13.9-13.6
1987-6.3-12.6-16.6 -24.4-21.6-20.1-18.6-14.0-11.2-5.6-1.4-4.5
1988-1.1-5.02.4 -1.310.0-3.911.314.920.114.621.010.8
198913.29.16.7 21.014.77.49.4-6.35.77.3-2.0-5.0
YearJanFebMarAprMayJunJulAugSepOctNovDec
1990-1.1-17.3-8.5 -0.513.11.05.5-5.0-7.61.8-5.3-2.4
19915.10.6-10.6 -12.9-19.3-5.5-1.7-7.6-16.6-12.9-7.3-16.7
1992-25.4-9.3-24.2 -18.70.5-12.8-6.91.40.8-17.2-7.3-5.5
1993-8.2-7.9-8.5 -21.1-8.2-16.0-10.8-14.0-7.6-13.50.61.6
1994-1.60.6-10.6 -22.8-13.0-10.4-18.0-17.2-17.2-14.1-7.3-11.6
1995-4.0-2.73.5 -16.2-9.0-1.54.20.83.2-1.31.3-5.5
19968.41.16.2 7.81.313.96.84.66.94.2-0.17.2
19974.113.3-8.5-16.2-22.4-24.1-9.5-19.8-14.8-17.8-15.2-9.1
1998-23.5-19.2-28.5-24.40.59.914.69.811.110.912.513.3
199915.68.68.918.51.31.04.82.1-0.49.113.112.8
YearJanFebMarAprMayJunJulAugSepOctNovDec
20005.112.99.416.83.6-5.5-3.75.39.99.722.47.7
20018.911.96.70.3-9.01.8-3.0-8.91.4-1.97.2-9.1
20022.77.7-5.2-3.8-14.5-6.3-7.6-14.6-7.6-7.4-6.0-10.6
2003-2.0-7.4-6.8-5.5-7.4-12.02.9-1.8-2.2-1.9-3.49.8
2004-11.68.60.2-15.413.1-14.4-6.9-7.6-2.8-3.7-9.3-8.0
20051.8-29.10.2-11.2-14.52.60.9-6.93.910.9-2.70.6
200612.70.113.815.2-9.8-5.5-8.9-15.9-5.1-15.3-1.4-3.0
2007-7.3-2.7-1.4-3.0-2.75.0-4.32.71.55.49.814.4
200814.121.312.24.5-4.35.0
YearJanFebMarAprMayJunJulAugSepOctNovDec
  Next SOI update expected: Monday 4th August 2008
 

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