| Year | Normalized ISOI | Status | Normalized ENSO index | Status |
| 1980 | 1.16 | Above−normal | 0.55 | Neutral |
| 1981 | 0.55 | Above−normal | 0.9 | Neutral |
| 1982 | −1.62 | Below−normal | 1.41* | Warm |
| 1983 | 0.01 | Above−normal | 0.68 | Neutral |
| 1984 | −0.47 | Below−normal | 0.67 | Neutral |
| 1985 | 2.01 | Above−normal | −1.12* | Cold |
| 1986 | 0.80 | Above−normal | −1.2* | Cold |
| 1987 | 0.02 | Above−normal | 0.12 | Neutral |
| 1988 | 0.03 | Above−normal | 2.08* | Warm |
| 1989 | 1.02 | Above−normal | −1.23* | Cold |
| 1990 | 1.66 | Above−normal | −1.53* | Cold |
| 1991 | 0.33 | Above−normal | 0.71 | Neutral |
| 1992 | −1.44 | Below−normal | 1.03* | Warm |
| 1993 | −0.38 | Below−normal | 0.67 | Neutral |
| 1994 | 0.41 | Above−normal | −0.58 | Neutral |
| 1995 | −0.1 | Below−normal | −0.5 | Neutral |
| 1996 | 0.39 | Above−normal | −0.58 | Neutral |
| 1997 | −0.1 | Below−normal | 1.84* | Warm |
| 1998 | 0.01 | Above−normal | 0.10 | Neutral |
| 1999 | 1.01 | Above−normal | −1.71* | Cold |
| 2000 | −0.31 | Below−normal | −1.36* | Cold |
| 2001 | 0.12 | Above−normal | 0.53 | Neutral |
| 2002 | −1.21 | Below−normal | 1.01* | Warm |
| 2003 | 0.07 | Above−normal | 0.36 | Neutral |
| 2004 | 0.00 | Above−normal | 0.56 | Neutral |
| 2005 | 0.59 | Above−normal | 0.05 | Neutral |
| 2006 | −0.04 | Below−normal | 0.14 | Neutral |
| 2007 | −0.61 | Below−normal | −0.88 | Neutral |
| 2008 | 0.06 | Above−normal | −1.11* | Cold |
| 2009 | −0.63 | Below−normal | −1.09* | Cold |
| 2010 | −0.55 | Below−normal | 0.21 | Neutral |
| 2011 | −0.56 | Below−normal | −1.83 | Cold |
| 2012 | 0.03 | Above−normal | −0.02 | Neutral |
| 2013 | −1.22 | Below−normal | −0.41 | Neutral |
| 2014 | −0.01 | Below−normal | 0.16 | Neutral |
| 2015 | −1.23 | Below−normal | 2.08 | Warm |