Pacific Decadel Oscillation
 Jan Null, CCM
Updated thru March 2024
 
PDO values and ENSO Type
 Source: https://www.ncei.noaa.gov/pub/data/cmb/ersst/v5/index/ersst.v5.pdo.dat
 WE=Weak El Niño, ME=Moderate El Niño, SE=Strong El Niño, VSE=Very Strong El Niño
WL=Weak La Niña, ML=Moderate La Niña, SL=Strong La Niña
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
  1950-1951 -3.7 -3.0 -2.4 -1.9 -1.5 -1.1 -1.2 -1.5 -1.7 -1.4 -1.3 -1.8
ME 1951-1952 -0.2 -1.8 -0.8 -0.1 -0.3 -1.5 -2.2 -1.4 -1.7 -1.9 -2.1 -2.1
WE 1952-1953 -2.1 -1.6 -1.4 -0.9 -0.5 -0.8 -0.2 -0.5 -1.3 -0.9 -0.6 -0.2
WE 1953-1954 0.1 -0.9 -1.1 -1.5 -0.5 -0.2 -1.1 -1.0 -1.2 -1.3 -0.8 0.5
WL 1954-1955 -0.1 -0.3 -1.1 0.0 0.9 0.5 -0.2 -1.0 -1.2 -2.2 -1.9 -2.2
ML 1955-1956 -2.8 -2.7 -2.5 -3.4 -2.6 -2.2 -2.3 -2.3 -2.9 -2.6 -1.6 -2.0
  1956-1957 -1.5 -1.0 -0.3 -1.7 -2.4 -1.3 -1.3 -1.6 -0.8 -0.8 0.0 1.5
SE 1957-1958 0.6 0.3 1.8 1.7 1.5 0.5 0.8 0.9 0.6 0.6 1.5 1.8
WE 1958-1959 0.6 1.1 0.8 0.3 0.3 1.1 1.0 0.4 -0.1 -0.2 -0.1 0.2
  1959-1960 -0.4 -0.3 -0.5 1.0 1.4 1.0 0.2 0.6 0.2 0.2 0.4 1.2
  1960-1961 -0.4 -0.3 -1.0 -0.3 -0.3 0.0 0.9 0.9 0.6 0.3 -0.5 -0.7
  1961-1962 -1.2 -0.9 -1.3 -1.8 -1.4 -1.7 -1.0 -0.9 -1.1 -1.0 -1.3 -1.7
  1962-1963 -1.8 -0.7 -1.5 -1.8 -0.4 -0.2 0.1 0.2 -0.3 -0.3 -1.3 -0.6
ME 1963-1964 -1.1 -1.0 1.1 0.3 -0.5 0.5 0.3 0.2 -0.7 -1.3 -2.4 -0.9
WL 1964-1965 -1.1 -1.6 -1.4 -0.6 -0.7 -0.6 -1.0 -0.6 -0.2 0.0 -0.7 -0.8
SE 1965-1966 -0.7 0.3 0.8 0.3 0.5 0.3 -0.7 -0.4 -1.0 -0.4 -0.8 0.1
  1966-1967 0.0 -0.3 -0.4 -0.6 -0.7 -0.2 -0.2 -0.3 -0.8 -1.1 -1.5 -1.2
  1967-1968 -1.2 -1.6 -0.6 -0.1 0.4 -0.7 -0.7 -0.2 0.1 -0.7 -0.8 0.1
ME 1968-1969 0.4 0.0 0.3 -0.2 0.0 -0.3 -0.7 -1.2 -1.2 -1.1 -1.1 0.8
WE 1969-1970 -0.4 -0.9 -1.1 1.0 0.6 1.1 1.1 1.0 1.2 0.3 -0.9 -0.1
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
ML 1970-1971 -0.9 -1.8 -1.7 -1.2 -0.9 -0.9 -1.3 -1.5 -1.6 -1.7 -1.8 -1.9
WL 1971-1972 -2.3 -0.3 -0.2 -0.4 -1.3 -1.8 -2.1 -2.0 -1.5 -1.7 -2.2 -1.8
SE 1972-1973 -1.5 -0.1 -0.2 -0.2 -0.1 -0.4 -0.2 -0.6 -0.9 -1.4 -1.6 -1.4
SL 1973-1974 -1.4 -1.6 -1.1 -1.4 -1.4 -0.9 -0.9 -1.4 -1.2 -0.6 -0.7 -0.4
WL 1974-1975 0.0 -0.3 0.7 0.2 0.6 0.3 -0.7 -0.9 -1.1 -1.8 -2.1 -1.6
SL 1975-1976 -0.8 -1.6 -1.6 -1.6 -1.7 -1.5 -1.1 -1.0 -1.3 -1.4 -1.2 -1.3
WE 1976-1977 0.3 1.0 0.6 1.1 1.3 1.2 1.2 1.5 0.6 -0.3 -0.5 0.0
WE 1977-1978 -0.1 -0.1 -0.6 -0.8 -0.5 -0.1 0.6 0.8 1.1 1.0 0.8 0.3
  1978-1979 -1.6 -0.9 -0.8 0.1 0.0 -0.5 -0.4 -1.3 -0.7 -0.1 0.6 0.2
WE 1979-1980 0.3 0.1 0.9 1.1 0.6 0.1 0.1 0.6 0.6 0.8 0.6 -0.7
  1980-1981 -0.2 0.1 -0.1 1.0 0.7 0.3 1.2 1.2 1.2 1.1 1.3 1.8
  1981-1982 0.8 -0.1 0.4 -0.1 0.5 0.6 0.1 -0.2 -0.4 -0.7 -1.2 -1.0
VSE 1982-1983 0.1 -0.1 0.5 0.2 -0.6 0.2 0.4 1.0 1.7 1.3 1.0 1.9
WL 1983-1984 2.5 1.2 0.5 0.7 1.2 1.7 1.4 1.2 1.6 1.0 0.9 -0.1
WL 1984-1985 -0.4 0.0 0.2 0.4 0.5 0.5 0.9 0.5 -0.3 -0.5 -0.9 0.0
  1985-1986 0.5 0.2 0.1 0.1 -0.7 0.3 1.0 1.5 1.7 1.2 0.9 0.6
ME 1986-1987 1.1 -0.2 0.0 1.0 1.7 1.7 1.5 1.5 1.4 1.4 0.8 0.1
SE 1987-1988 1.4 1.7 1.4 0.7 0.9 0.9 0.2 0.5 0.5 0.3 0.4 0.2
SL 1988-1989 -0.2 -0.9 -1.0 -0.4 -0.1 -0.1 -1.2 -1.5 -1.2 -0.3 -0.1 0.1
  1989-1990 0.6 -0.4 -0.6 -0.5 -0.8 -0.1 -0.4 -1.3 -1.2 -0.2 -0.3 -0.3
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
  1990-1991 -0.3 -0.4 -0.3 -1.2 -1.9 -2.2 -1.8 -1.1 -1.1 -1.6 -1.7 -2.3
SE 1991-1992 -1.6 -0.6 0.4 0.4 0.6 -0.2 0.1 0.2 0.1 0.6 1.3 1.2
  1992-1993 1.5 0.9 0.5 1.3 1.3 0.3 -0.3 0.0 0.2 1.0 1.8 2.1
  1993-1994 1.5 2.0 1.2 1.3 1.1 0.7 0.9 0.3 0.3 0.5 0.6 0.1
ME 1994-1995 -0.9 -0.9 -1.5 -1.1 -1.9 -2.2 -0.9 0.0 0.5 0.5 0.9 1.0
ML 1995-1996 1.0 -0.1 1.2 0.6 0.1 0.4 1.0 1.0 0.9 1.4 2.1 1.1
  1996-1997 0.6 -0.7 0.1 0.4 0.4 0.0 0.4 0.3 0.4 0.7 1.6 2.6
VSE 1997-1998 1.5 2.3 1.8 1.8 1.5 1.0 1.1 1.5 1.3 0.0 -0.8 -0.8
SL 1998-1999 -1.2 -0.9 -1.7 -2.2 -1.0 -1.1 -0.8 -1.1 -1.2 -1.9 -2.3 -2.3
SL 1999-2000 -1.9 -1.8 -2.2 -2.5 -2.2 -1.9 -2.2 -1.3 -0.7 -0.6 -0.8 -0.6
WL 2000-2001 -1.5 -1.7 -1.5 -1.6 -1.0 0.0 0.5 0.0 -0.4 -1.2 -1.1 -1.2
  2001-2002 -2.2 -1.7 -2.0 -1.9 -1.3 -1.1 -0.4 -1.5 -1.3 -1.2 -1.3 -1.2
ME 2002-2003 -0.7 0.1 -0.2 -0.2 1.1 1.6 1.5 1.2 1.0 0.4 0.2 -0.4
  2003-2004 0.4 0.6 -0.2 0.7 -0.2 -0.6 -0.6 -0.2 -0.2 0.0 0.6 -0.1
WE 2004-2005 0.0 0.2 0.0 -0.7 -1.2 -0.6 -0.2 0.0 0.7 0.3 1.4 0.9
WL 2005-2006 0.1 -0.4 -1.0 -2.0 -1.9 -0.1 0.5 0.4 -0.7 -0.5 -0.4 0.2
WE 2006-2007 0.4 -0.9 -1.5 -0.5 -0.8 -0.4 -0.7 -0.7 -1.1 -0.5 -0.3 -0.1
SL 2007-2008 0.4 0.1 -1.0 -2.3 -1.5 -0.9 -1.5 -1.5 -1.3 -1.8 -1.6 -1.9
WL 2008-2009 -2.0 -1.9 -1.9 -1.9 -1.6 -1.3 -1.8 -1.8 -2.1 -2.2 -1.3 -0.7
ME 2009-2010 -0.7 -0.5 0.3 -0.1 -0.9 -0.5 0.1 0.3 -0.2 0.0 -0.2 -0.8
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
SL 2010-2011 -2.0 -2.2 -2.5 -1.6 -1.6 -2.0 -1.8 -1.5 -1.3 -1.0 -0.7 -1.1
ML 2011-2012 -2.3 -2.4 -2.5 -1.9 -3.0 -2.4 -1.9 -1.4 -1.7 -1.0 -2.1 -1.6
  2012-2013 -2.4 -2.6 -3.0 -1.2 -0.7 -1.3 -1.1 -1.4 -1.5 -0.7 -0.4 -1.2
  2013-2014 -1.3 -1.6 -1.0 -1.7 -1.1 -1.0 -0.6 -0.4 0.3 0.4 1.3 -0.3
WE 2014-2015 0.3 0.3 0.8 1.4 1.4 1.9 1.5 1.5 1.3 0.9 0.3 0.8
VSE 2015-2016 1.4 1.0 1.0 0.8 0.2 0.3 0.8 1.3 1.6 1.7 1.6 0.9
WL 2016-2017 0.6 -0.6 -0.8 -0.4 1.0 0.6 -0.1 0.0 0.1 0.6 0.5 0.4
WL 2017-2018 -0.4 -0.6 -0.2 -0.7 -0.6 0.0 0.4 -0.1 -0.7 -0.8 -0.5 -0.7
WE 2018-2019 0.0 -0.2 -0.4 -0.6 -0.7 -0.2 -0.3 -0.7 -0.4 0.1 0.3 -0.1
  2019-2020 0.5 0.0 0.1 -0.9 -0.5 0.0 -1.4 -1.5 -1.8 -1.3 -0.5 -0.8
ML 2020-2021 -0.9 -1.3 -1.0 -0.6 -1.6 -1.0 -0.6 -1.1 -1.7 -1.9 -2.0 -1.8
ML 2021-2022 -2.0 -0.9 -2.0 -3.1 -2.8 -2.7 -2.4 -1.9 -1.7 -2.1 -2.3 -1.3
WL 2022-2023 -2.6 -2.4 -2.3 -1.8 -2.4 -2.2 -1.3 -1.7 -2.5 -3.1 -2.4 -2.5
  2023-2024 -2.5 -2.5 -3.0 -2.2 -1.8 -1.7 -1.6 -1.3 -1.6      
ENSO Type Season Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
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