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Southern Oscillation Index gives an indication of the development and intensity of El Niño or La Niña events in the Pacific Ocean.

Southern Oscillation Index, by Month and Year
Southern Oscillation Index
(In index)
  1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
January -1 5 -25 -8 -2 -4 8 4 -24 16 5 9 3 -2 -12 2 13 -7 14 9 -10 20 9 -1
February -17 1 -9 -8 1 -3 1 13 -19 9 13 12 8 -7 9 -29 0 -3 21 15 -15 22 3 -4
March -9 -11 -24 -9 -11 4 6 -9 -29 9 9 7 -5 -7 0 0 14 -1 12 0 -11 21 3 11
April -1 -13 -19 -21 -23 -16 8 -16 -24 19 17 0 -4 -6 -15 -11 15 -3 5 9 15 25 -7 0
May 13 -19 1 -8 -13 -9 1 -22 1 1 4 -9 -15 -7 13 -15 -10 -3 -4 -5 10 2 -3 8
June 1 -6 -13 -16 -10 -2 14 -24 10 1 -6 2 -6 -12 -14 3 -6 5 5 -2 2 0 -10 14
July 6 -2 -7 -11 -18 4 7 -10 15 5 -4 -3 -8 3 -7 1 -9 -4 2 2 21 11 -2 8
August -5 -8 1 -14 -17 1 5 -20 10 2 5 -9 -15 -2 -8 -7 -16 3 9 -5 19 2 -5 -1
September -8 -17 1 -8 -17 3 7 -15 11 -0 10 1 -8 -2 -3 4 -5 2 14 4 25 12 3 4
October 2 -13 -17 -14 -14 -1 4 -18 11 9 10 -2 -7 -2 -4 11 -15 5 13 -15 18 7 2 -2
November -5 -7 -7 1 -7 1 -0 -15 13 13 22 7 -6 -3 -9 -3 -1 10 17 -7 16 14 4 9
December -2 -17 -6 2 -12 -6 7 -9 13 13 8 -9 -11 10 -8 1 -3 14 13 -7 27 23 -6 1
Source: Australian Bureau of Meteorology (ABM)

Last updated: July 21, 2014

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