This file contains the ENSO categories for 1950-2020 based on the
methodology described in the Arguez et al. (2019) publication (see
Documentation for reference). These categories are in turn used to
compute the ENSO Normals 2020 product files. For each year, the ENSO
category is reported for 12 overlapping three-month seasons: DJF
(December-January-February), JFM (January-February-March), ... OND
(October-November-December), and NDJ (November-December-January). The
categories are Strong La Nina (-2), Weak La Nina (-1), Neutral (0),
Weak El Nino (1), and Strong El Nino (2).
1950 -2 -2 -2 -2 -2 -2 -1 -1 -1 -1 -1 -1
1951 -1 -1 0 0 1 1 1 1 1 1 1 1
1952 0 0 0 0 0 0 0 0 0 0 0 0
1953 0 1 2 2 2 2 2 2 1 1 1 1
1954 1 1 0 -1 -1 -1 -1 -1 -1 -1 -1 -1
1955 -1 -1 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2
1956 -2 -1 -1 -1 -1 -1 -1 -1 -1 -1 0 0
1957 0 0 1 2 2 2 2 2 2 2 2 2
1958 2 2 2 2 2 1 1 1 1 0 0 0
1959 0 0 0 0 0 0 0 0 0 0 0 0
1960 0 0 0 0 0 0 0 0 0 0 0 0
1961 0 0 0 0 0 0 0 0 0 0 0 0
1962 0 0 0 0 0 0 0 0 0 0 0 0
1963 0 0 0 0 1 1 2 2 2 2 2 2
1964 2 1 0 -1 -1 -1 -1 -1 -1 -1 -1 -1
1965 -1 0 0 0 1 2 2 2 2 2 2 2
1966 2 2 2 2 1 0 0 0 0 0 0 0
1967 0 0 0 0 0 0 0 0 0 0 0 0
1968 0 0 0 0 0 0 1 1 1 1 1 1
1969 1 1 1 1 1 1 1 1 1 1 1 0
1970 0 0 0 0 0 -1 -1 -1 -1 -1 -1 -2
1971 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2 -1 -1
1972 -1 0 0 1 2 2 2 2 2 2 2 2
1973 2 2 1 0 -1 -2 -2 -2 -2 -2 -2 -2
1974 -2 -2 -2 -2 -2 -2 -1 -1 -1 -1 -1 -1
1975 -1 -1 -1 -2 -2 -2 -2 -2 -2 -2 -2 -2
1976 -2 -2 -2 -1 -1 0 0 1 1 1 1 1
1977 1 1 1 0 0 1 1 1 1 1 1 1
1978 1 0 0 0 -1 -1 -1 -1 -1 0 0 0
1979 0 0 0 0 0 0 0 0 0 0 0 1
1980 1 1 1 1 1 1 0 0 0 0 0 0
1981 0 -1 -1 -1 -1 -1 0 0 0 0 0 0
1982 0 0 0 1 2 2 2 2 2 2 2 2
1983 2 2 2 2 2 2 1 0 -1 -1 -1 -1
1984 -1 0 0 0 0 0 0 0 0 -1 -1 -2
1985 -2 -2 -2 -2 -2 -2 -1 -1 -1 0 0 0
1986 0 0 0 0 0 0 0 1 1 1 1 2
1987 2 2 2 2 2 2 2 2 2 2 2 1
1988 1 1 0 0 -2 -2 -2 -2 -2 -2 -2 -2
1989 -2 -2 -2 -2 -2 -1 -1 0 0 0 0 0
1990 0 0 0 0 0 0 0 0 0 0 0 0
1991 0 0 0 0 1 1 1 1 1 1 2 2
1992 2 2 2 2 2 2 1 0 0 0 0 0
1993 0 0 1 1 1 1 1 0 0 0 0 0
1994 0 0 0 1 1 1 1 1 1 1 1 1
1995 1 1 1 1 0 0 0 -1 -1 -1 -1 -1
1996 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0
1997 0 0 0 0 2 2 2 2 2 2 2 2
1998 2 2 2 2 1 0 -2 -2 -2 -2 -2 -2
1999 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2
2000 -2 -2 -2 -2 -2 -2 -1 -1 -1 -1 -1 -1
2001 -1 -1 -1 -1 0 0 0 0 0 0 0 0
2002 0 0 0 0 1 2 2 2 2 2 2 2
2003 1 1 1 0 0 0 0 0 0 0 0 0
2004 0 0 0 0 0 0 1 1 1 1 1 1
2005 1 1 1 1 0 0 0 0 0 0 -1 -1
2006 -1 -1 -1 -1 0 0 0 0 1 1 1 1
2007 1 0 0 0 -1 -1 -1 -2 -2 -2 -2 -2
2008 -2 -2 -2 -2 -2 -2 -1 0 0 0 -1 -1
2009 -1 -1 -1 -1 0 0 1 1 1 2 2 2
2010 2 2 2 1 0 -2 -2 -2 -2 -2 -2 -2
2011 -2 -2 -2 -2 -1 -1 -1 -1 -1 -1 -1 -1
2012 -1 -1 -1 -1 -1 0 0 0 0 0 0 0
2013 0 0 0 0 0 0 0 0 0 0 0 0
2014 0 0 0 0 0 0 0 0 0 1 1 1
2015 1 1 1 2 2 2 2 2 2 2 2 2
2016 2 2 2 2 1 0 -1 -1 -1 -1 -1 -1
2017 0 0 0 0 0 0 0 0 -1 -1 -1 -1
2018 -1 -1 -1 -1 0 0 0 0 1 1 1 1
2019 1 1 1 1 1 1 0 0 0 0 0 0
2020 0 0 0 0 0 -1 -1 -1 -2 -2 -2 -2
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