Analyses | digital values for the Pacific and non-Pacific
The indices presented on this page capture ENSO-related tropical rainfall variability. The data is that of Dai et al., (1997) and is available online both in ASCII and in netCDF formats. This pair of indices is the latest in an evolution of indices that I have created based on different rain gauge data sets, and it may not be the last. The preceding efforts for tropical Pacific and the tropics not including the Pacific are available.
The averaging regions employed are:
tropical Pacific: 6.25N-6.25S, 163.75E-86.25W
tropical non-Pacific: 20N-20S, 78.75W-163.75E
The time series values are calculated with respect to a 1950-79 climatology.
I also tried a tropical Pacific index for the region centered slightly
south of the equator (6.25N-11.25S, 163.75E-86.25W), but this was not
as well correlated with the eastern eq. Pacific SST as the 6.25N-6.25S
index.
References:
The following index values are in mm/mon.
jan feb mar apr may jun jul aug sep oct nov dec
1892 92 -149 -45 -62 184 99 111 -142 -102 2 -109 138
1893 -252 64 -32 -164 -92 -22 -95 -64 -6 -96 -105 -132
1894 -270 -247 -179 -192 -112 62 -83 -30 -74 -91 -83 -193
1895 -1 67 -57 -189 -29 -54 -123 -95 19 -11 112 45
1896 25 -53 -11 -59 61 -6 140 73 133 233 45 308
1897 -106 47 -48 -121 -39 -3 -20 -124 -86 0 46 -240
1898 -184 99 -180 -138 -110 -85 -102 -57 -103 -88 -99 -200
1899 -260 -226 -189 -178 -74 178 41 165 -15 22 156 150
1900 -165 501 91 156 240 125 -36 220 -25 -1 220 1
1901 51 -1 202 -93 11 -57 -133 -70 -69 -103 -85 -78
1902 -150 -122 -86 -14 263 155 287 38 298 -4 294 38
1903 -37 119 -91 -20 46 -97 -105 -126 -112 -108 -81 -131
1904 -165 -244 -149 -193 32 -62 42 100 155 -34 104 -33
1905 129 194 106 332 125 175 190 26 84 358 82 80
1906 205 -102 -61 -76 -98 -41 -119 -119 -94 -77 158 -43
1907 -105 -76 -84 -119 -97 -60 -67 -81 -74 65 37 -59
1908 314 33 -181 -147 -88 72 -77 -7 -55 -99 -91 -142
1909 -154 -116 -61 -31 -108 -53 -10 -54 -56 -82 -83 -181
1910 -169 -172 -110 -104 34 35 -20 -70 -75 -62 -72 -125
1911 -73 -66 164 144 21 33 176 2 246 163 81 240
1912 393 413 386 275 137 -8 -64 -58 9 137 -20 226
1913 -46 33 -26 -156 -88 -88 -37 21 96 83 79 113
1914 196 180 168 119 201 126 368 13 86 84 127 240
1915 197 107 308 202 394 -16 68 -66 -78 -91 -104 -174
1916 -57 -178 -136 -168 -109 -88 -111 -112 -100 -98 -106 -245
1917 -222 -201 -168 -161 -59 0 20 -92 -27 -85 -88 -151
1918 -212 -154 20 -145 14 120 304 402 201 212 137 192
1919 299 290 202 170 20 58 154 114 133 144 27 71
1920 -99 255 192 10 -74 133 -1 -58 -75 -97 -101 -175
1921 61 -176 -155 -153 -104 -98 -43 -42 -31 -46 -51 65
1922 46 -9 -92 -13 42 40 54 3 -54 -90 -31 -151
1923 -156 -141 2 -64 -90 63 111 149 42 68 241 138
1924 256 8 -20 -115 -104 -89 -72 -74 -80 -41 -99 -205
1925 -201 -116 -135 -114 -5 25 -20 40 17 214 17 247
1926 255 164 411 302 96 83 -26 27 -59 -67 -44 -181
1927 -223 -182 -124 -170 -86 -68 -32 -43 11 -63 -2 131
1928 286 172 -91 -76 -103 -55 -55 -78 -24 -33 -16 23
1929 -40 99 -86 -96 -47 8 42 99 16 -20 52 155
1930 210 92 180 -126 29 18 148 250 332 147 226 206
1931 265 85 147 -76 -74 83 -59 -36 -89 -19 -84 -141
1932 73 16 62 37 28 -14 -20 -45 -46 -73 -87 -179
1933 23 -108 -83 -30 -14 30 66 -55 -83 -66 -86 -184
1934 -195 -139 -99 -117 -26 38 -32 -28 -61 -74 -42 -74
1935 -12 -36 -152 -100 -55 -37 -21 -73 21 -28 -22 30
1936 62 19 19 -24 9 -48 -7 -16 -53 -38 114 -26
1937 12 6 -66 -88 -82 -10 -25 -25 4 -46 -55 -150
1938 -95 -126 -139 -97 -80 -52 -72 -57 -68 -70 -20 -84
1939 -125 -139 -112 -68 20 -2 27 39 48 -22 154 199
1940 80 205 135 285 135 197 128 83 92 222 206 217
1941 168 175 290 128 67 198 154 122 230 107 188 -56
1942 383 -88 105 3 -41 -77 -112 -23 -84 -64 -81 -167
1943 -189 -86 -125 -58 -23 -14 53 54 -73 -54 -40 27
1944 -14 -57 -88 -13 -7 6 25 -43 -48 -4 -46 -113
1945 -104 -64 -93 -131 66 95 50 0 -61 -69 -48 -75
1946 -32 -52 43 84 58 128 106 39 -4 47 87 -5
1947 179 -41 -109 -41 -19 -1 -58 -56 -67 -45 -21 -20
1948 103 62 142 119 141 72 -3 -40 -54 -64 23 26
1949 160 22 106 -8 -22 21 -21 -76 -65 -56 -89 -158
1950 -173 -125 -143 -113 -91 -72 -70 -55 -57 -58 -70 -118
1951 -71 -110 -51 0 130 131 102 180 27 35 -4 109
1952 102 -32 -20 -12 -21 17 -23 1 -26 -20 -2 11
1953 48 201 25 169 172 26 38 122 85 78 29 76
1954 -18 -67 -17 -36 -63 -54 -59 -38 -38 -51 -57 -111
1955 -33 -106 -74 -35 -61 -49 -64 -55 -26 -52 -76 -137
1956 -136 -102 -45 16 -10 -13 -35 -24 -18 -18 -45 -89
1957 -101 29 17 21 78 103 92 24 76 120 200 134
1958 107 128 147 170 128 89 49 11 -27 -20 56 58
1959 9 163 118 -1 13 -1 -21 -54 -38 -8 -17 -5
1960 100 -28 -46 13 18 -41 -10 -31 -31 -11 -19 -27
1961 1 13 42 -30 -10 -5 -32 28 -39 -37 -3 -113
1962 -68 -107 -56 -60 -48 -50 12 -30 -1 -55 -3 -102
1963 -102 -110 -87 -85 -72 -4 3 55 61 80 101 138
1964 92 122 -55 -112 -74 -77 -71 -33 -37 -60 -63 -62
1965 -43 51 11 77 6 25 114 144 141 153 119 68
1966 202 52 130 110 1 -27 78 -60 -39 1 -41 -47
1967 -56 -56 -88 -19 -61 -21 -29 -51 -29 -38 -41 37
1968 0 -31 -99 -129 -94 -62 4 -63 -17 -45 14 -48
1969 66 92 174 106 46 26 -2 -32 30 -30 -8 54
1970 2 33 15 78 -2 -27 -80 -52 -60 -80 -109 -173
1971 -197 -136 -123 -70 -50 -41 -39 3 -66 -55 -58 -14
1972 3 -76 -93 -58 96 103 140 116 227 189 129 275
1973 197 201 54 -6 2 -40 -124 -65 -73 -72 -76 -141
1974 -170 -95 -108 -59 -18 -31 14 -45 -45 -38 -68 16
1975 44 -2 69 -9 -62 -9 -68 -80 -57 -70 -76 -128
1976 -125 -105 22 34 57 111 103 93 92 40 50 104
1977 177 5 114 84 8 9 77 15 42 43 141 130
1978 98 118 69 -5 -52 -45 -57 -28 -46 -45 -25 10
1979 43 80 99 -40 35 26 -45 2 -9 121 23 94
1980 66 -5 197 18 51 1 33 60 -3 15 52 15
1981 -51 -56 58 109 7 7 -62 -61 -64 -70 -58 33
1982 -76 -54 -116 -87 -14 3 119 59 53 45 54 84
1983 153 -12 41 8 172 271 153 -29 -1 13 -62 -49
1984 -62 -76 -139 -81 -38 -48 -62 -70 -71 -1 -37 -31
1985 -117 -96 -98 -80 -48 -18 -33 -25 -55 -21 -46 -62
1986 -32 -127 -59 -37 -48 12 -5 28 93 -70 57 124
1987 68 262 49 120 80 107 153 81 30 -21 -3 30
1988 63 29 -55 -74 -18 -44 -67 -59 -47 -33 -100 -118
1989 -146 -157 -112 -40 -63 -79 -57 -57 -35 -36 14 -29
1990 1 41 86 111 1 -82 -25 12 67 -83 14 -3
1991 31 87 517 -10 60 39 92 200 168 -131 40 -4
1992 -79 -156 -23 158 46 48 -29 -13 -6 -1 -51 163
1993 -58 119 9 80 41 46 29 44 11 101 -999 140
1994 -1 -99 -74 28 -10 -27 -117 4 25 40 -66 57
1995 21 -71 -104 228 -56 -16 -58 -40 5 -83 -86 -34
1996 153 -15 -131 -3 6 8
Tropical non-Pacific index
The values are in tenths mm/mon.
jan feb mar apr may jun jul aug sep oct nov dec
1850 -111 -80 400 108 -341 -994 -381-1511 1 -212 -436 -281
1851 -128 517 366 822 -50 167 -401-1249 -585 -327 150 -238
1852 -468 504 618 -463 -140 -746 -874-1673 163 594 179 156
1853 -328 -173 7 -114 199 -127 -648-1398 -620 -709 -246 -605
1854 26 152 -365 12 -148 -302 -234 -270 -165 -107 -293 -382
1855 -413 355 215 57 -750 -228-1081 -852 -308 -213 -627 -383
1856 -270 -247 -299 443 380 -468 -303 -353 -447 -389 -188 576
1857 -133 416 11 -367 905 -272 -702 144 -457 320 -237 -310
1858 -154 -404 -220 -160 486 -487 -654 -647 -240 -48 211 -202
1859 -409 -384 -253 71 -495 63 -424 -399 59 -188 -85 -323
1860 110 35 -129 -218 -782 -728 -709 -495 -163 -25 -370 -32
1861 285 176 -427 57 -884 -346 -416 15 -393 -555 -153 -268
1862 -192 -127 -174 -670 -198 -143-1110 758 -170 312 -231 -343
1863 -153 -213 -2 95 -578 694 291 -19 -375 74 -425 -221
1864 -228 -273 -439 -312 -633 517 -45 -233 136 -366 -325 -268
1865 -300 -295 123 242 203 -58 -109 318 -136 84 86 83
1866 34 237 202 52 68 -64 -179 -110 -259 218 -71 98
1867 -255 180 -1 -355 -210 -551 -518 -108 351 87 -461 -138
1868 -138 -97 -82 -153 -183 439 -690 -311 -115 -249 -200 -165
1869 -222 57 -105 -88 -425 441 -275 -216 156 82 -55 144
1870 353 109 -304 -64 -28 -469 -223 -138 -20 577 -201 8
1871 161 103 39 28 146 193 -218 -516 93 -239 153 101
1872 144 -221 -249 -296 -247 -212 10 60 120 -183 279 197
1873 220 127 99 19 -616 182 -219 -62 -203 194 -148 -6
1874 -42 116 -243 58 209 4 -141 -128 26 348 10 -105
1875 -193 270 -29 154 -143 21 -136 -288 189 -48 -87 16
1876 -134 23 -15 -22 221 -114 260 -133 340 -116 -215 78
1877 -52 -104 199 -380 -381 179 -412 -46 23 -207 -85 -207
1878 -250 -508 96 -147 59 143 -103 437 447 83 -169 53
1879 264 -107 535 205 482 -125 -8 480 -105 170 122 -13
1880 295 -57 360 251 68 -166 324 69 171 -159 315 -74
1881 116 -83 116 66 -49 201 -161 56 210 -308 260 -191
1882 -11 174 139 119 97 313 378 -133 216 169 252 202
1883 -199 105 -261 234 -2 230 31 -194 -53 122 139 -95
1884 -129 154 13 -253 -87 -95 -79 -176 -164 55 93 249
1885 -289 -77 -168 -41 -256 167 -100 -190 -263 134 -45 509
1886 -267 145 54 -95 88 235 86 309 56 411 263 660
1887 -163 158 188 197 26 144 130 19 102 104 141 399
1888 -2 -144 -348 -28 71 178 -348 -167 -217 -168 -101 20
1889 -313 3 -335 -28 6 234 185 126 206 142 89 336
1890 90 -218 -64 -50 -17 -144 33 -203 43 8 -3 -240
1891 224 93 -194 -31 132 87 -51 -237 24 26 -66 -70
1892 135 -230 87 126 127 -165 -151 -71 50 230 -141 52
1893 -72 -46 12 119 99 -59 62 88 -128 132 230 21
1894 330 160 85 145 -137 371 -18 -102 62 25 107 43
1895 154 -133 49 -97 -14 112 94 29 -32 64 -71 52
1896 122 178 16 36 16 102 -231 55 -187 -215 122 51
1897 -118 51 -172 -25 181 -72 -120 86 -35 -38 -178 262
1898 24 139 111 148 129 45 9 59 120 -37 83 288
1899 52 -132 352 138 -86 -134 -240 -156 -84 25 -139 -124
1900 12 -282 -152 -45 -78 66 31 -16 -34 -177 -81 -138
1901 -153 261 241 11 -89 32 121 -33 -109 32 47 -70
1902 -22 106 -21 -151 -103 -209 -132 -83 -95 -176 -226 -146
1903 -198 -97 -29 -60 -76 -53 94 121 -19 -84 -89 294
1904 279 -38 151 146 13 99 -21 -162 -39 30 -187 -1
1905 -195 -130 -225 -48 -19 -28 -46 -62 -70 -7 -85 -230
1906 -51 -118 -74 93 9 152 6 34 22 23 24 122
1907 -43 174 2 14 -25 -72 -74 -84 -197 -141 -11 215
1908 -158 92 -68 21 95 -19 46 84 116 -37 24 69
1909 -10 -16 -57 38 -40 79 186 124 74 136 59 -87
1910 38 64 32 77 76 119 -42 197 167 46 111 152
1911 -73 7 -92 -36 -69 -58 -151 -166 -102 -77 -153 -43
1912 -103 169 -70 -151 -156 -26 46 -5 -128 -33 44 -26
1913 89 52 127 30 18 16 -32 -152 -135 -89 -143 -18
1914 96 -173 -136 -154 -220 -17 -15 -108 -142 -200 -170 -74
1915 -183 -340 -338 -158 -75 70 -7 -127 92 -28 45 96
1916 109 -109 99 -56 -21 93 109 128 211 232 159 249
1917 262 113 150 -35 -54 57 -66 158 248 75 96 233
1918 341 94 -114 -93 77 -8 -244 -75 -221 -207 -88 -103
1919 -27 -114 -187 -191 -29 -112 -25 -140 -119 -187 -72 -20
1920 40 -175 -29 30 -173 -33 29 -60 -3 -7 4 -42
1921 59 93 239 -30 -66 -123 74 0 41 46 152 -4
1922 -88 27 51 -91 -55 -105 -51 -69 99 51 85 2
1923 84 -9 114 86 -42 5 111 -50 -116 -22 -101 -68
1924 -99 5 138 21 -27 95 49 70 48 176 179 125
1925 95 63 161 3 -133 38 -40 -28 -25 10 -29 -74
1926 137 -41 78 -27 -16 -44 -26 19 34 -57 -104 192
1927 39 12 52 24 27 -10 112 -34 -26 27 -18 -87
1928 -27 62 152 5 -12 -77 -36 25 -54 42 -51 33
1929 71 45 133 -21 24 53 -60 -4 -8 -108 -105 9
1930 -59 -100 -48 -19 16 -16 -141 -196 -14 7 -73 36
1931 22 -123 -43 -47 -52 -35 36 10 76 39 35 8
1932 33 -143 19 -185 62 -76 -29 -167 -53 50 -3 87
1933 -19 -83 -27 -14 27 59 104 130 47 37 143 148
1934 77 111 86 69 -100 32 92 105 15 -8 63 5
1935 -54 -43 142 34 65 73 34 -14 -16 20 50 -82
1936 -55 -40 -8 -32 104 60 -60 -12 -83 -23 -56 6
1937 60 -125 -83 67 31 -73 61 -49 -63 -39 -70 -4
1938 -31 -54 -64 49 -11 -6 -23 11 70 -26 133 33
1939 92 38 38 -9 -42 -61 -27 -25 -56 -37 41 4
1940 72 13 5 -61 63 -44 -93 108 -113 -143 -128 -150
1941 -82 -75 -24 -123 -33 -41 -142 -67 -99 -70 43 -28
1942 -155 -60 -127 -24 37 -56 -36 10 -113 -4 -56 163
1943 52 45 2 -16 9 -62 -68 -24 32 18 -9 -31
1944 -155 58 28 -49 -91 -13 -24 -28 -24 33 -19 53
1945 19 37 74 -96 21 -83 43 31 -27 29 -28 13
1946 -5 -87 -176 -61 -23 -61 -95 11 -16 -57 6 43
1947 -125 56 210 64 -43 -22 -1 143 76 8 -115 -7
1948 -35 28 -23 2 -122 -23 -104 -35 -56 -67 16 -120
1949 -129 16 -100 11 114 -34 8 11 37 3 -63 -63
1950 92 43 78 51 -49 -47 62 82 115 52 -60 80
1951 -22 -4 -90 -122 29 -31 -38 -103 -38 57 16 -35
1952 -49 55 -47 -36 32 -2 -35 42 47 54 6 -58
1953 40 -27 -6 -15 -13 3 113 -60 -65 -43 22 -5
1954 -40 -9 -30 75 17 67 -5 174 104 57 14 88
1955 2 96 26 64 95 78 72 15 161 106 135 -2
1956 104 79 48 140 27 -12 -12 110 34 70 60 155
1957 -9 -74 44 -65 -41 -12 33 -5 -132 -72 -126 82
1958 -66 -97 -66 -13 -51 -20 -102 65 -107 -16 -73 -89
1959 -18 -70 107 3 53 -19 91 12 37 -124 -13 -34
1960 11 65 33 30 25 39 19 -50 41 -39 47 -22
1961 -33 -44 -99 -9 -7 48 85 55 43 -23 17 74
1962 194 -1 -28 -6 50 0 38 84 55 -40 16 50
1963 112 168 4 49 -27 -63 -22 64 -70 -71 -63 -24
1964 -82 -54 -11 26 43 -61 -9 11 77 93 25 -82
1965 -42 -189 61 -74 -22 -25 -31 -204 -83 -84 -125 30
1966 -158 5 -101 -93 14 -37 -15 -29 -94 9 15 35
1967 86 3 46 3 -18 19 62 49 -34 -51 -8 -80
1968 67 50 -14 -35 -106 0 59 -60 -28 -102 -46 -34
1969 -70 -97 -86 -76 16 -16 73 -33 -46 19 -39 1
1970 -33 -114 -48 64 -10 6 -65 90 51 92 42 -59
1971 56 81 92 -16 30 117 -8 25 15 81 -22 -147
1972 -45 52 -3 -68 -8 -113 -174 -209 -182 -199 -75 -72
1973 -115 -132 -38 6 -9 23 0 80 145 144 140 151
1974 -4 117 85 84 -89 -46 65 40 83 116 -26 7
1975 -53 -26 47 6 18 103 111 91 155 32 42 143
1976 91 68 107 18 88 -96 -162 -157 -234 -2 29 -91
1977 15 179 -50 -29 -80 -74 -111 -24 -10 1 -23 -53
1978 -15 -70 -10 21 27 40 19 -95 10 -52 -18 95
1979 -15 -54 -51 16 -34 130 -111 -60 -49 -63 89 -105
1980 98 124 -129 -118 -15 -28 9 35 -43 -57 -57 3
1981 72 8 -82 -36 -58 -146 -108 -133 28 -47 32 91
1982 37 22 -107 -24 -13 -45 -187 -147 -155 -118 -219 -188
1983 -307 -295 -217 -166 -65 -128 -85 -81 -122 -86 -46 20
1984 13 74 -42 61 -64 -92 -55 -189 -177 -40 -6 -53
1985 1 -8 -5 18 -50 -91 -101 -24 -16 -51 7 -7
1986 98 -96 19 -30 -91 -59 -191 -188 -83 74 37 -12
1987 -84 -42 -29 -85 -86 -155 -168 -131 -191 -55 -91 -4
1988 -214 -63 -46 -16 -137 -21 50 130 96 2 96 79
1989 79 -19 128 70 42 -63 -13 31 -145 -45 -113 78
1990 -20 -206 -239 -20 117 23 -228 -80 -110 -60 -137 -184
1991 50 11 -31 -56 -160 -111 -77 -51 -228 -274 -210 -260
1992 -296 -128 -392 -313 -194 -163 -132 -96 -148 -105 -170 -154
1993 -199 -19 -189 -73 -176 -186 -77 -198 -167 -151 -86 -18
1994 -146 -20 -59 -136 -119 5 -46 -29 -96 -189 -144 -177
1995 -203 -86 -18 -152 80 -190 -94 79 -71 6 -31 18
1996 -4 154 -40 80 -131 -182