Table of
  1. T
  2. NOAA NCEP CPC Indices NHTI East Pacific/North Pacific Pattern
Additional Information

TimeEast Pacific/North Pacific Pattern
months since 1960-01-01
Jan 19500.91
Feb 1950-1.13
Mar 1950-0.02
Apr 1950-1.87
May 1950-0.98
Jun 1950-0.47
Jul 19501.38
Aug 19501.87
Sep 19500.98
Oct 1950-0.88
Nov 1950-0.39
Jan 1951-0.81
Feb 1951-1.32
Mar 19510.2
Apr 19510.02
May 1951-0.04
Jun 1951-0.62
Jul 19510.98
Aug 19510.41
Sep 19511.42
Oct 1951-0.11
Nov 19510.62
Jan 19521.59
Feb 1952-1.09
Mar 1952-2.13
Apr 1952-2.44
May 19520.06
Jun 1952-0.25
Jul 19521.3
Aug 19521.35
Sep 19520.35
Oct 19521.1
Nov 1952-0.62
Jan 19530.24
Feb 1953-1.51
Mar 1953-2.29
Apr 1953-0.07
May 1953-0.63
Jun 19533.88
Jul 19530.99
Aug 1953-0.54
Sep 19530.12
Oct 1953-0.52
Nov 1953-2.15
Jan 19540.6
Feb 1954-1.75
Mar 19541.51
Apr 19540.08
May 19540.2
Jun 1954-1.64
Jul 1954-1.79
Aug 19540.83
Sep 19540.31
Oct 1954-0.53
Nov 1954-0.48
Jan 1955-1.32
Feb 1955-1.71
Mar 1955-0.13
Apr 1955-1.35
May 1955-1.61
Jun 1955-2.84
Jul 1955-1.49
Aug 19550.61
Sep 1955-0.15
Oct 1955-1.09
Nov 1955-0.37
Jan 1956-0.39
Feb 1956-1.99
Mar 1956-1.13
Apr 19560.29
May 1956-0.05
Jun 1956-1.95
Jul 19560.48
Aug 19561.92
Sep 19560.98
Oct 1956-1.43
Nov 1956-0.82
Jan 19571.42
Feb 1957-0.98
Mar 1957-0.56
Apr 19570.26
May 19570.85
Jun 19571.71
Jul 1957-1.03
Aug 19570.49
Sep 19571.78
Oct 19570.84
Nov 19570.6
Jan 1958-0.38
Feb 19580.13
Mar 19580.45
Apr 19580.73
May 19580.11
Jun 19583.0
Jul 19581.51
Aug 19580.14
Sep 1958-0.13
Oct 1958-0.29
Nov 19580.73
Jan 19591.62
Feb 19590.04
Mar 1959-2.03
Apr 19590.22
May 19590.3
Jun 19591.19
Jul 1959-0.14
Aug 19590.34
Sep 1959-0.43
Oct 19591.03
Nov 19591.43
Jan 1960-0.76
Feb 19600.52
Mar 19600.12
Apr 1960-0.39
May 1960-0.74
Jun 1960-0.71
Jul 19600.65
Aug 1960-0.08
Sep 19600.02
Oct 19600.38
Nov 1960-0.4
Jan 19611.09
Feb 1961-1.5
Mar 1961-1.47
Apr 19610.6
May 19610.26
Jun 1961-0.61
Jul 1961-0.76
Aug 19610.31
Sep 1961-0.91
Oct 1961-0.75
Nov 1961-1.92
Jan 19620.74
Feb 19621.66
Mar 19620.25
Apr 19620.56
May 19620.26
Jun 19620.26
Jul 19620.16
Aug 1962-0.22
Sep 1962-0.15
Oct 19620.1
Nov 1962-0.5
Jan 19631.0
Feb 19631.07
Mar 1963-1.31
Apr 1963-0.25
May 19630.57
Jun 1963-2.46
Jul 1963-1.71
Aug 19631.74
Sep 19631.02
Oct 1963-1.47
Nov 1963-0.95
Jan 1964-1.95
Feb 1964-2.52
Mar 1964-1.39
Apr 1964-2.03
May 19640.33
Jun 19641.9
Jul 1964-2.58
Aug 19640.78
Sep 19640.16
Oct 19640.17
Nov 1964-0.74
Jan 19650.6
Feb 1965-0.93
Mar 19652.23
Apr 19651.02
May 19650.07
Jun 1965-1.56
Jul 19650.75
Aug 19652.32
Sep 19652.26
Oct 19650.85
Nov 19650.21
Jan 1966-0.36
Feb 1966-0.55
Mar 1966-0.94
Apr 19661.96
May 1966-0.67
Jun 19660.23
Jul 1966-0.57
Aug 19660.63
Sep 19661.58
Oct 19660.46
Nov 19660.74
Jan 1967-0.22
Feb 1967-0.56
Mar 19670.87
Apr 19670.14
May 19672.02
Jun 19670.88
Jul 1967-0.12
Aug 19671.1
Sep 19670.35
Oct 1967-0.24
Nov 1967-0.03
Jan 1968-0.24
Feb 1968-0.65
Mar 19680.05
Apr 1968-2.88
May 19681.07
Jun 1968-0.73
Jul 19681.71
Aug 19680.75
Sep 1968-0.91
Oct 1968-0.33
Nov 1968-0.16
Jan 19690.6
Feb 1969-0.58
Mar 1969-0.02
Apr 19690.32
May 19691.0
Jun 19693.19
Jul 1969-1.13
Aug 1969-0.14
Sep 19690.09
Oct 19691.67
Nov 1969-0.11
Jan 19700.23
Feb 19700.61
Mar 19700.62
Apr 1970-0.45
May 1970-0.57
Jun 1970-0.72
Jul 1970-1.42
Aug 19700.93
Sep 1970-0.27
Oct 1970-0.72
Nov 1970-0.05
Jan 19710.05
Feb 1971-1.99
Mar 1971-0.22
Apr 1971-1.95
May 1971-1.14
Jun 1971-0.28
Jul 19712.19
Aug 19711.78
Sep 1971-0.39
Oct 1971-0.49
Nov 1971-0.34
Jan 1972-0.46
Feb 19720.15
Mar 1972-1.36
Apr 1972-1.52
May 19720.31
Jun 1972-2.96
Jul 19722.2
Aug 19721.76
Sep 19720.93
Oct 19721.48
Nov 1972-0.32
Jan 1973-0.8
Feb 19730.95
Mar 1973-1.94
Apr 19730.6
May 1973-1.49
Jun 1973-1.3
Jul 1973-1.27
Aug 1973-0.1
Sep 19730.68
Oct 1973-0.62
Nov 1973-0.27
Jan 1974-0.65
Feb 1974-1.12
Mar 19740.32
Apr 1974-0.41
May 19740.03
Jun 1974-2.29
Jul 1974-1.52
Aug 19742.42
Sep 19742.56
Oct 19740.18
Nov 1974-1.75
Jan 1975-1.52
Feb 1975-0.5
Mar 1975-0.14
Apr 1975-1.57
May 1975-1.21
Jun 1975-2.09
Jul 19750.6
Aug 19750.99
Sep 19750.81
Oct 1975-0.56
Nov 1975-1.14
Jan 1976-0.3
Feb 19760.07
Mar 1976-0.83
Apr 1976-1.52
May 1976-0.9
Jun 1976-0.03
Jul 1976-1.21
Aug 19760.23
Sep 19761.82
Oct 19761.53
Nov 19762.19
Jan 19770.75
Feb 1977-1.4
Mar 1977-1.44
Apr 19770.25
May 1977-1.84
Jun 1977-0.24
Jul 19770.03
Aug 19771.69
Sep 1977-0.47
Oct 1977-0.29
Nov 19770.05
Jan 19782.76
Feb 19780.48
Mar 19781.38
Apr 19780.82
May 1978-0.23
Jun 19780.5
Jul 19781.7
Aug 19780.77
Sep 1978-0.48
Oct 19780.43
Nov 19781.28
Jan 19792.12
Feb 1979-0.18
Mar 19790.83
Apr 19790.66
May 1979-0.87
Jun 1979-0.48
Jul 1979-0.24
Aug 19791.82
Sep 19790.58
Oct 19790.87
Nov 19790.92
Jan 19800.53
Feb 19800.86
Mar 19800.15
Apr 1980-0.75
May 1980-0.7
Jun 19801.59
Jul 1980-0.35
Aug 1980-0.15
Sep 19800.43
Oct 19801.24
Nov 19800.15
Jan 19811.02
Feb 1981-0.03
Mar 19810.03
Apr 1981-0.19
May 19810.48
Jun 1981-0.82
Jul 1981-0.94
Aug 19810.7
Sep 1981-0.4
Oct 1981-0.01
Nov 1981-1.5
Jan 19821.11
Feb 19821.16
Mar 19820.41
Apr 1982-0.98
May 1982-1.29
Jun 19820.1
Jul 19820.44
Aug 19820.54
Sep 19820.54
Oct 1982-0.57
Nov 19820.38
Jan 1983-0.31
Feb 1983-0.31
Mar 1983-0.6
Apr 1983-0.46
May 19830.63
Jun 1983-0.95
Jul 1983-1.67
Aug 1983-1.43
Sep 1983-0.56
Oct 1983-0.57
Nov 1983-0.5
Jan 1984-0.97
Feb 1984-1.41
Mar 19840.98
Apr 1984-1.7
May 1984-0.64
Jun 1984-0.76
Jul 1984-0.1
Aug 19840.85
Sep 19841.25
Oct 1984-0.49
Nov 1984-0.94
Jan 19851.0
Feb 1985-2.41
Mar 1985-0.67
Apr 1985-1.64
May 1985-0.31
Jun 1985-0.75
Jul 19851.93
Aug 19851.15
Sep 1985-0.22
Oct 1985-0.75
Nov 19851.25
Jan 19860.52
Feb 19860.83
Mar 19860.07
Apr 1986-1.56
May 1986-1.17
Jun 19860.23
Jul 1986-0.35
Aug 19862.55
Sep 19860.87
Oct 19861.35
Nov 19861.54
Jan 1987-0.74
Feb 1987-0.49
Mar 19870.73
Apr 1987-0.68
May 1987-0.26
Jun 1987-1.09
Jul 19870.94
Aug 19870.97
Sep 19870.49
Oct 19871.2
Nov 1987-0.67
Jan 19881.13
Feb 1988-0.13
Mar 19880.26
Apr 1988-0.63
May 1988-1.16
Jun 1988-0.93
Jul 19880.1
Aug 19880.44
Sep 1988-0.19
Oct 19880.99
Nov 1988-1.31
Jan 1989-1.81
Feb 19892.34
Mar 19890.6
Apr 19891.29
May 19890.45
Jun 19890.09
Jul 1989-1.23
Aug 19891.32
Sep 19890.66
Oct 19890.0
Nov 1989-0.04
Jan 1990-0.58
Feb 1990-1.86
Mar 19900.03
Apr 19901.72
May 19900.21
Jun 19900.71
Jul 19900.88
Aug 1990-0.39
Sep 19900.78
Oct 1990-0.43
Nov 1990-0.76
Jan 1991-0.45
Feb 19910.31
Mar 1991-0.38
Apr 1991-0.14
May 1991-1.13
Jun 19911.02
Jul 1991-0.58
Aug 1991-0.81
Sep 19911.2
Oct 19911.24
Nov 19911.01
Jan 1992-0.17
Feb 19920.7
Mar 19921.28
Apr 19921.46
May 19921.02
Jun 1992-0.14
Jul 19921.83
Aug 19920.43
Sep 1992-0.87
Oct 19920.59
Nov 19920.3
Jan 1993-0.65
Feb 19932.12
Mar 19930.21
Apr 19930.71
May 19930.37
Jun 19931.59
Jul 19930.73
Aug 19930.66
Sep 19932.48
Oct 19932.44
Nov 19930.31
Jan 19942.38
Feb 19940.47
Mar 1994-1.06
Apr 19940.98
May 1994-0.76
Jun 1994-0.14
Jul 19940.9
Aug 19940.83
Sep 19940.24
Oct 1994-0.4
Nov 1994-2.04
Jan 19951.03
Feb 19950.05
Mar 19950.61
Apr 19951.13
May 19950.72
Jun 19950.02
Jul 19951.11
Aug 1995-0.92
Sep 19951.9
Oct 1995-0.32
Nov 19951.07
Jan 19960.26
Feb 19960.27
Mar 19962.41
Apr 19960.07
May 19961.15
Jun 1996-0.96
Jul 1996-0.17
Aug 19960.92
Sep 1996-0.02
Oct 1996-0.54
Nov 19961.61
Jan 19970.22
Feb 1997-0.03
Mar 1997-0.06
Apr 19971.7
May 19972.43
Jun 1997-0.56
Jul 1997-1.32
Aug 1997-0.08
Sep 19970.36
Oct 19970.1
Nov 19970.65
Jan 19980.62
Feb 1998-0.33
Mar 19981.31
Apr 1998-0.49
May 1998-1.36
Jun 19980.23
Jul 19980.12
Aug 1998-1.67
Sep 1998-0.52
Oct 1998-1.27
Nov 1998-0.52
Jan 1999-0.89
Feb 1999-1.12
Mar 1999-0.73
Apr 1999-0.57
May 1999-0.69
Jun 1999-1.44
Jul 19990.34
Aug 19990.32
Sep 1999-0.44
Oct 1999-0.24
Nov 1999-1.33
Jan 2000-0.92
Feb 2000-0.55
Mar 2000-0.4
Apr 20000.08
May 2000-0.62
Jun 2000-0.24
Jul 2000-1.26
Aug 20000.63
Sep 20000.49
Oct 2000-0.72
Nov 20000.2
Jan 2001-0.9
Feb 20010.26
Mar 2001-1.16
Apr 20010.06
May 2001-1.42
Jun 20010.55
Jul 2001-1.3
Aug 2001-1.17
Sep 2001-0.46
Oct 2001-0.04
Nov 2001-0.33
Jan 2002-0.11
Feb 2002-0.89
Mar 20021.99
Apr 20020.45
May 20021.52
Jun 2002-0.2
Jul 2002-0.69
Aug 2002-0.07
Sep 2002-0.4
Oct 20021.77
Nov 20022.05
Jan 20032.07
Feb 20030.94
Mar 20030.56
Apr 20030.34
May 2003-0.57
Jun 20030.17
Jul 2003-0.14
Aug 2003-1.46
Sep 2003-0.7
Oct 20030.85
Nov 2003-0.11
Jan 20040.66
Feb 2004-0.5
Mar 2004-1.28
Apr 20041.23
May 20041.92
Jun 20043.36
Jul 20041.19
Aug 20040.07
Sep 2004-2.21
Oct 2004-0.71
Nov 2004-0.26
Jan 20050.73
Feb 2005-0.29
Mar 20050.31
Apr 20050.81
May 20050.09
Jun 20051.43
Jul 2005-1.11
Aug 2005-0.6
Sep 2005-1.98
Oct 2005-1.6
Nov 20050.35
Jan 2006-1.07
Feb 20060.57
Mar 20060.2
Apr 2006-1.57
May 2006-0.31
Jun 2006-0.49
Jul 2006-0.46
Aug 20060.13
Sep 20060.47
Oct 20060.97
Nov 2006-0.38
Jan 2007-1.14
Feb 20070.93
Mar 2007-1.27
Apr 2007-0.19
May 2007-0.67
Jun 20070.0
Jul 20070.49
Aug 2007-0.67
Sep 2007-1.29
Oct 2007-1.96
Nov 20070.68
Jan 2008-1.25
Feb 2008-0.4
Mar 2008-1.62
Apr 2008-0.5
May 20080.21
Jun 2008-1.13
Jul 2008-1.13
Aug 2008-0.36
Sep 2008-0.11
Oct 2008-1.0
Nov 20080.65
Jan 2009-0.18
Feb 20090.32
Mar 2009-1.12
Apr 20090.49
May 20091.31
Jun 2009-0.39
Jul 20091.65
Aug 2009-1.39
Sep 2009-1.02
Oct 20090.7
Nov 2009-1.62
Jan 2010-0.58
Feb 2010-0.51
Mar 2010-1.63
Apr 2010-1.21
May 2010-0.15
Jun 20101.5
Jul 2010-0.22
Aug 2010-1.48
Sep 2010-0.34
Oct 2010-0.58
Nov 20100.27
Jan 2011-0.42
Feb 2011-0.12
Mar 2011-0.03
Apr 2011-0.63
May 2011-1.18
Jun 2011-0.48
Jul 2011-2.23
Aug 2011-0.67
Sep 2011-0.53
Oct 2011-0.81
Nov 2011-1.34
Jan 2012-1.92
Feb 2012-0.33
Mar 2012-2.59
Apr 20120.31
May 2012-1.46
Jun 2012-0.95
Jul 2012-1.01
Aug 20120.63
Sep 20120.16
Oct 20120.58
Nov 20120.12
Jan 20130.12
Feb 2013-0.88
Mar 20130.7
Apr 20131.24
May 2013-0.26
Jun 20131.68
Jul 20130.93
Aug 2013-1.09
Sep 2013-1.44
Oct 20130.99
Nov 20131.16
Jan 20141.11
Feb 20140.31
Mar 20141.24
Apr 20140.05
May 20140.77
Jun 2014-0.69
Jul 20140.33
Aug 2014-1.03
Sep 20140.2
Oct 2014-0.66
Nov 20143.21
Jan 20151.27
Feb 20151.18
Mar 20151.13
Apr 2015-0.35
May 20150.49
Jun 20151.72
Jul 20150.23
Aug 2015-0.28
Sep 2015-1.38
Oct 20150.33
Nov 2015-0.94
Jan 2016-0.35
Feb 20160.23
Mar 20160.24
Apr 20161.47
May 20160.14
Jun 20161.26
Jul 2016-0.36
Aug 2016-0.42
Sep 2016-1.41
Oct 2016-0.84
Nov 2016-1.43
Jan 20170.39
Feb 20170.21
Mar 2017-1.04
Apr 20171.04
May 2017-0.72
Jun 20170.5
Jul 20170.0
Aug 2017-1.65
Sep 2017-0.46
Oct 2017-0.58
Nov 20170.41
Jan 20180.66
Feb 20180.23
Mar 20180.3
Apr 2018-0.18
May 2018-0.98
Jun 20180.05
Jul 2018-0.16
Aug 2018-0.78
Sep 2018-0.83
Oct 20181.17
Nov 20181.42
Jan 20191.07
Feb 20191.2
Mar 20192.11
Apr 20190.67
May 20190.32
Jun 20191.74
Jul 20190.1
Aug 2019-1.18
Sep 2019-1.5
Oct 2019-0.47
Nov 20191.93
Jan 2020-0.6
Feb 2020-1.79
Mar 20200.44
Apr 20201.54
May 20200.04
Jun 2020-0.69
Jul 2020-1.97
Aug 2020-2.39
Sep 20200.06
Oct 20200.57
Nov 2020-0.66
Jan 2021-0.71
Feb 2021-0.8
Mar 2021-1.29
Apr 20210.8
May 20210.0
Jun 2021-0.26
Jul 2021-1.28
Aug 2021-1.82
Sep 2021-1.89
Oct 2021-2.42
Nov 20210.34
Jan 20220.51
Feb 2022-0.9
Mar 20220.35
Apr 2022-0.73
May 2022-0.34
Jun 2022-0.04
Jul 2022-1.64
Aug 2022-1.11
Sep 2022-0.81
Oct 2022-0.06
Nov 20220.42