Pacific Decadal Oscillation (PDO)

The Pacific Decadal Oscillation (PDO) is often described as a long-lived El Niño-like pattern of Pacific climate variability (Zhang et al. 1997). As seen with the better-known El Niño/Southern Oscillation (ENSO), extremes in the PDO pattern are marked by widespread variations in the Pacific Basin and the North American climate. In parallel with the ENSO phenomenon, the extreme phases of the PDO have been classified as being either warm or cool, as defined by ocean temperature anomalies in the northeast and tropical Pacific Ocean. When SSTs are anomalously cool in the interior North Pacific and warm along the Pacific Coast, and when sea level pressures are below average over the North Pacific, the PDO has a positive value. When the climate anomaly patterns are reversed, with warm SST anomalies in the interior and cool SST anomalies along the North American coast, or above average sea level pressures over the North Pacific, the PDO has a negative value (Courtesy of Mantua, 1999).

The NCEI PDO index is based on NOAA's extended reconstruction of SSTs (ERSST Version 4). It is constructed by regressing the ERSST anomalies against the Mantua PDO index for their overlap period, to compute a PDO regression map for the North Pacific ERSST anomalies. The ERSST anomalies are then projected onto that map to compute the NCEI index. The NCEI PDO index closely follows the Mantua PDO index.

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Download: xml csv json
DatePDO
185401-1.17
185402-0.95
185403-0.75
185404-0.52
185405-0.52
185406-0.92
185407-1.35
185408-1.52
185409-0.91
185410-1.25
185411-0.63
185412-0.69
1855010.33
1855020.44
1855030.08
185504-1.08
185505-2.05
185506-1.74
185507-1.80
185508-1.41
185509-0.93
185510-0.58
185511-0.21
1855120.20
1856010.07
1856020.34
185603-0.46
185604-0.89
185605-0.92
185606-0.70
185607-0.25
1856080.06
185609-0.83
185610-0.27
185611-0.13
185612-0.46
185701-0.91
185702-0.63
185703-0.47
185704-0.25
1857050.24
1857060.80
1857070.75
1857080.51
185709-0.06
185710-0.24
185711-0.27
185712-0.89
185801-1.46
185802-0.63
185803-0.82
185804-0.21
185805-0.03
1858060.51
185807-0.10
185808-0.11
185809-0.10
185810-0.19
1858110.75
1858120.57
1859010.72
185902-0.64
185903-0.94
185904-1.43
185905-1.29
185906-1.25
185907-0.43
185908-1.64
185909-1.76
185910-1.00
185911-0.04
185912-0.85
186001-1.13
186002-1.07
186003-1.00
186004-0.70
186005-0.44
1860060.56
1860070.55
1860080.12
1860093.07
1860100.57
186011-0.06
186012-0.76
186101-0.93
186102-1.17
186103-1.21
186104-1.10
186105-0.82
186106-0.64
186107-0.68
186108-0.97
186109-1.11
186110-1.54
186111-0.75
186112-0.51
186201-0.03
1862020.19
1862030.31
1862040.25
1862050.16
1862060.27
1862070.26
186208-0.26
186209-0.74
186210-0.67
186211-0.19
186212-0.23
186301-0.18
186302-0.18
186303-0.25
186304-0.02
1863050.23
1863060.12
186307-0.20
186308-0.24
1863090.12
1863100.33
1863110.33
1863120.06
186401-0.02
186402-0.12
186403-0.40
186404-0.38
186405-0.17
1864060.07
186407-0.18
186408-0.28
186409-0.34
186410-0.29
186411-0.10
186412-0.01
186501-0.53
186502-0.71
186503-0.14
186504-0.21
186505-0.22
186506-0.14
186507-0.05
1865080.02
186509-0.33
186510-0.35
186511-0.40
186512-0.64
186601-1.66
186602-1.64
186603-1.75
186604-0.01
186605-0.54
186606-0.37
186607-0.24
186608-0.27
186609-0.32
186610-0.19
1866110.04
186612-0.02
186701-0.01
186702-0.09
186703-0.26
186704-0.27
186705-0.17
186706-0.27
186707-0.26
186708-0.42
186709-0.49
186710-0.51
186711-0.38
186712-0.35
186801-0.22
186802-0.23
186803-0.23
186804-0.31
186805-0.44
186806-0.17
186807-0.14
186808-0.13
1868090.00
186810-0.11
186811-0.41
186812-0.23
186901-0.12
186902-0.05
1869030.28
1869040.84
1869052.22
1869063.01
1869072.40
1869080.43
1869090.25
1869100.43
186911-0.06
1869120.04
187001-0.49
187002-0.31
187003-0.68
187004-0.88
187005-1.16
187006-0.70
1870070.24
1870080.63
1870090.02
187010-0.56
187011-1.78
187012-1.21
187101-0.98
187102-0.41
187103-0.13
1871040.05
1871050.33
1871060.89
187107-0.42
187108-0.49
187109-0.79
187110-1.06
187111-1.47
187112-0.60
187201-0.41
187202-0.33
187203-0.23
187204-0.52
187205-0.32
187206-0.22
187207-0.52
187208-0.82
187209-0.16
187210-0.34
187211-1.97
187212-2.21
187301-2.27
187302-1.77
187303-1.43
187304-0.48
187305-0.50
187306-0.40
187307-0.49
187308-1.24
187309-1.50
187310-1.11
187311-1.04
187312-1.02
187401-0.75
187402-0.38
187403-0.47
187404-0.50
1874050.21
187406-0.05
187407-0.20
187408-0.34
1874090.22
1874100.72
1874110.85
187412-0.42
187501-0.84
187502-1.35
187503-1.48
187504-1.60
187505-0.86
187506-0.88
187507-1.31
187508-1.62
187509-1.37
187510-0.59
1875110.00
187512-0.27
187601-0.77
187602-0.89
187603-0.89
187604-0.09
187605-1.87
187606-0.75
187607-1.81
187608-2.71
187609-1.67
187610-0.67
187611-0.58
187612-1.15
187701-0.73
187702-0.14
1877030.68
187704-0.65
187705-0.55
187706-1.11
187707-0.95
187708-1.08
187709-1.30
187710-1.46
187711-3.02
1877120.20
187801-0.59
187802-0.34
1878030.19
1878041.36
1878051.39
1878062.84
1878071.69
1878080.48
187809-0.83
187810-0.31
1878110.77
1878121.16
187901-0.67
1879020.14
1879030.34
1879041.01
187905-1.12
187906-1.25
187907-2.15
187908-0.46
187909-0.78
187910-1.27
187911-1.02
187912-0.67
188001-0.82
188002-1.13
188003-2.01
188004-3.23
188005-3.16
188006-2.99
188007-2.78
188008-2.54
188009-2.14
188010-1.18
188011-1.52
1880120.68
1881010.27
188102-1.00
188103-0.36
1881040.56
1881050.29
1881060.08
188107-1.31
188108-2.01
1881090.46
1881100.58
188111-0.05
188112-0.64
188201-2.71
188202-1.98
188203-2.61
188204-2.92
188205-2.51
188206-1.10
188207-2.50
188208-0.84
188209-0.78
188210-1.68
188211-1.88
188212-0.72
188301-1.48
188302-1.57
188303-1.51
188304-0.49
188305-0.51
188306-0.87
188307-1.75
188308-1.94
188309-2.14
188310-1.21
188311-0.14
188312-1.40
188401-1.97
188402-1.67
188403-1.09
188404-0.43
1884050.05
1884060.69
1884070.90
1884081.12
1884090.68
188410-0.19
1884111.30
1884121.40
1885013.69
1885020.63
1885031.59
1885041.17
1885050.74
188506-0.52
188507-0.51
188508-0.42
188509-0.64
1885100.02
188511-0.11
188512-0.51
188601-0.41
188602-0.22
188603-1.01
188604-0.56
188605-0.47
188606-1.47
188607-0.16
188608-0.61
188609-0.39
188610-1.04
188611-1.68
188612-1.20
188701-0.64
188702-1.90
188703-1.68
188704-1.76
188705-1.95
188706-0.59
188707-0.42
188708-1.05
188709-1.22
188710-0.47
188711-1.01
188712-1.29
188801-0.89
188802-0.48
188803-1.14
188804-0.99
1888050.98
1888061.96
1888071.94
1888080.85
1888091.07
1888100.95
1888110.45
1888120.52
1889010.33
1889020.06
188903-0.13
1889040.87
1889050.77
1889060.69
188907-0.19
188908-1.09
188909-0.31
1889100.41
1889111.38
1889120.08
189001-0.64
189002-0.69
189003-1.22
189004-0.53
189005-0.71
189006-1.88
189007-1.15
189008-0.78
189009-0.54
189010-0.37
189011-0.44
189012-0.35
189101-0.41
189102-0.65
189103-0.53
189104-0.93
189105-0.23
189106-0.52
189107-0.19
189108-0.36
189109-0.82
1891100.23
1891110.29
189112-0.17
189201-1.02
189202-0.80
189203-0.22
189204-0.88
189205-1.45
189206-1.45
189207-1.16
189208-1.68
189209-2.85
189210-1.95
189211-0.01
189212-0.34
189301-0.38
189302-0.10
189303-0.64
189304-1.00
189305-3.01
189306-2.50
189307-2.25
189308-1.98
189309-1.63
189310-2.02
189311-1.85
189312-2.03
189401-2.31
189402-3.64
189403-3.74
189404-4.25
189405-3.63
189406-2.26
189407-2.08
189408-2.65
189409-3.16
189410-3.73
189411-3.18
189412-1.55
189501-1.02
189502-0.39
1895030.25
189504-0.12
189505-0.16
1895060.18
1895070.92
1895080.27
189509-2.09
189510-1.81
189511-2.22
189512-2.02
189601-0.83
189602-0.32
189603-0.33
189604-0.84
189605-1.77
189606-1.95
189607-1.68
189608-1.58
1896091.67
1896101.14
1896111.18
189612-0.15
1897010.43
1897020.10
189703-0.19
1897040.08
189705-0.26
1897060.65
1897070.69
1897080.34
1897090.04
1897100.77
1897110.65
1897121.02
1898011.56
1898020.90
189803-0.54
1898041.06
1898051.44
1898060.88
189807-0.28
189808-0.28
189809-0.09
1898100.15
1898110.40
1898120.10
1899010.22
189902-0.41
189903-0.03
189904-0.36
189905-1.15
189906-1.47
189907-0.50
189908-0.08
189909-0.77
189910-0.67
189911-0.02
1899120.56
1900010.52
1900020.03
1900030.66
1900042.43
1900050.58
1900060.50
1900070.41
1900080.52
190009-0.20
1900100.11
1900110.14
1900120.30
1901010.77
1901020.65
1901030.19
190104-0.55
190105-0.98
190106-1.22
190107-1.34
1901080.09
1901090.31
1901100.15
190111-0.24
1901120.78
1902011.16
1902021.06
1902030.51
1902040.69
1902051.09
1902062.18
1902073.28
1902082.15
1902090.88
1902100.51
1902110.17
1902120.45
1903010.15
190302-0.12
190303-0.23
190304-1.49
190305-0.41
1903060.01
1903070.83
1903080.95
1903090.27
1903100.36
1903110.06
1903120.27
1904011.04
1904020.89
1904030.81
1904040.15
1904050.46
190406-0.43
190407-1.51
1904080.61
1904092.73
1904101.60
1904111.26
1904120.71
1905011.50
190502-0.04
1905031.12
1905041.88
1905051.57
1905061.71
1905071.54
1905082.23
1905091.48
190510-0.11
1905111.18
1905120.09
1906011.27
1906021.16
1906030.11
190604-0.48
1906050.87
1906060.96
1906070.79
1906080.68
1906090.54
1906101.30
1906110.96
190612-0.23
190701-0.56
190702-0.44
190703-2.29
190704-1.19
1907050.75
1907061.00
1907070.82
1907080.34
1907090.42
1907101.62
1907111.57
1907121.88
1908011.73
1908021.48
1908030.37
190804-0.18
190805-0.27
190806-0.20
190807-0.04
190808-0.03
1908090.26
1908100.61
1908111.52
1908121.22
1909010.44
1909020.45
1909030.71
1909040.12
190905-0.31
190906-0.22
190907-1.68
190908-2.25
190909-1.94
190910-0.13
190911-0.97
190912-2.29
191001-2.33
191002-1.11
191003-1.11
191004-2.57
191005-1.73
191006-0.18
191007-0.10
191008-1.12
1910090.50
191010-0.74
191011-0.62
1910120.44
191101-0.69
191102-1.43
191103-1.76
191104-0.82
191105-0.83
191106-0.82
1911070.49
1911080.65
191109-0.26
191110-0.17
191111-0.16
191112-1.21
191201-0.72
191202-0.45
191203-0.84
191204-0.62
191205-0.01
1912060.60
1912070.34
1912080.35
1912091.10
1912100.83
1912110.01
191212-0.10
191301-0.61
191302-0.33
191303-0.52
191304-0.93
1913050.01
1913060.24
1913071.03
1913081.22
1913090.75
1913100.32
1913110.26
191312-0.11
191401-0.37
191402-0.41
191403-0.21
1914040.74
1914050.27
191406-0.63
191407-0.87
191408-1.08
191409-1.21
191410-0.63
191411-0.24
191412-0.16
191501-0.72
191502-0.79
1915030.14
1915041.28
1915051.43
1915061.40
1915071.04
1915080.43
191509-0.16
191510-1.47
191511-1.52
191512-1.09
191601-1.83
191602-1.77
191603-1.46
191604-0.70
191605-0.49
191606-1.48
191607-1.45
191608-2.23
191609-2.16
191610-1.90
191611-2.57
191612-2.86
191701-2.08
191702-2.08
191703-2.16
191704-1.86
191705-1.19
191706-0.87
191707-0.76
191708-0.69
191709-1.30
191710-1.69
191711-1.07
191712-1.06
191801-0.13
191802-0.43
191803-0.96
191804-0.98
191805-1.17
191806-0.41
191807-0.05
1918080.39
1918090.68
1918101.51
1918111.30
1918120.39
1919010.47
1919020.04
191903-0.67
191904-0.53
191905-1.17
191906-1.31
191907-1.82
191908-1.03
191909-0.36
191910-0.70
191911-0.90
191912-0.62
192001-1.10
192002-0.99
192003-1.14
192004-1.56
192005-1.30
192006-1.18
192007-1.67
192008-2.38
192009-2.54
192010-1.67
192011-0.81
192012-0.59
192101-1.26
192102-1.61
192103-1.07
192104-1.74
192105-1.35
192106-0.79
192107-1.68
192108-2.01
192109-1.66
192110-1.75
192111-0.95
192112-0.25
192201-0.45
192202-1.51
192203-1.76
192204-1.71
192205-1.61
192206-1.11
192207-0.78
192208-0.74
192209-0.55
192210-0.55
192211-1.18
1922120.27
1923010.01
192302-0.95
192303-1.23
192304-0.64
192305-0.02
192306-0.96
1923070.49
192308-0.02
192309-0.26
1923100.22
192311-0.22
192312-0.32
192401-0.89
192402-0.82
192403-0.45
192404-1.05
192405-0.48
192406-0.32
192407-1.14
192408-1.44
192409-1.71
192410-2.23
192411-1.77
192412-0.59
192501-1.34
192502-0.90
192503-0.82
192504-1.05
192505-0.30
192506-1.09
192507-0.83
192508-0.85
1925090.08
1925100.16
1925110.51
1925120.46
1926010.88
1926021.20
1926031.09
1926041.73
1926052.18
1926061.79
1926072.00
1926081.54
1926091.39
1926101.54
1926112.26
1926121.65
1927010.68
1927021.20
1927030.73
192704-0.05
192705-0.06
1927060.52
192707-0.36
192708-0.76
192709-0.11
192710-0.75
192711-0.42
192712-0.32
1928010.31
1928020.58
1928030.78
1928040.40
1928050.60
1928061.09
192807-0.51
192808-0.89
192809-1.87
192810-1.19
1928110.01
1928120.55
1929010.50
1929020.09
192903-0.04
1929040.21
1929050.42
1929060.79
192907-0.05
192908-0.31
1929090.73
1929100.96
1929110.63
1929121.44
1930010.83
1930020.51
193003-0.01
1930040.15
193005-0.12
1930060.17
1930070.12
193008-0.33
1930090.27
193010-0.13
193011-0.23
1930120.52
1931010.72
1931020.90
1931030.89
1931041.59
1931051.95
1931061.96
1931072.01
1931080.75
1931090.62
193110-0.17
193111-0.35
193112-1.15
193201-1.41
193202-1.99
193203-1.16
1932040.19
193205-0.04
193206-0.04
193207-0.20
193208-0.48
193209-1.24
193210-0.25
193211-0.38
193212-0.14
193301-0.92
193302-1.26
193303-1.15
193304-0.99
193305-1.80
193306-1.98
193307-3.14
193308-2.82
193309-2.79
193310-1.78
193311-0.60
193312-0.81
193401-0.53
193402-0.22
1934030.69
1934041.21
1934050.61
193406-0.24
1934070.11
1934081.15
1934091.00
1934101.79
1934111.37
1934121.36
1935010.55
1935020.02
193503-0.37
1935040.14
1935050.71
1935061.35
1935070.51
1935080.22
1935090.23
1935100.20
193511-0.10
1935121.09
1936011.66
1936021.15
1936030.88
1936041.00
1936051.46
1936062.39
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193704-0.76
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1938020.05
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1940062.23
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1940101.32
1940111.42
1940122.66
1941012.77
1941022.89
1941032.57
1941042.35
1941052.24
1941063.07
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1941082.96
1941091.97
1941101.22
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1942090.11
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1944020.23
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1954060.64
1954070.07
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1958030.68
1958040.76
1958051.55
1958061.62
1958070.52
1958081.13
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1959020.36
1959030.07
195904-0.05
195905-0.06
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1964020.24
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1965080.30
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1966060.04
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1969060.81
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197904-0.19
1979050.52
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1979070.18
1979080.08
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1979101.06
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198006-0.78
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1983061.82
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1984021.25
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1984040.97
1984050.89
198406-0.12
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1984080.02
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1985020.52
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1985060.04
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1996070.48
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2010010.06
2010020.16
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201206-1.45
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201303-1.19
201304-0.62
201305-0.41
201306-1.24
201307-1.77
201308-1.78
201309-1.10
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201312-1.15
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2014030.29
2014040.41
2014051.07
201406-0.34
2014070.13
201408-0.05
2014090.53
2014101.32
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2015021.75
2015031.49
2015040.89
2015050.30
2015060.63
2015071.18
2015080.65
2015090.82
2015100.71
2015110.13
2015120.52
2016010.79
2016021.23
2016031.55
2016041.60
2016051.43
2016060.75
2016070.18