```MEI.ext Ranks (created: 10 May 2011)

Bimonthly ranks of the MEI.ext, Dec1870/Jan1871 through Nov/Dec 2005, or 135 full years. If two MEI
values are identical within the same bimonthly season, their rank is split between them, leading to
a ".5" value.

How can one interpret these ranks?  Given that there are 135 numbers in each column, the lowest
number (1) would denote the strongest La Nina case for that bimonthly season, while the highest
number (135) would indicate the strongest El Nino case.  For instance, in December-January
(DECJAN), the strongest La Nina was recorded in 1974, while the strongest El Nino occurred in 1983,
showing that the period since 1950 harbors the most extreme cases for that season.

If we use percentiles (say, 30%ile) to define La Nina, near-normal, and El Nino, MEI ranks from 1-41
denote weak to strong La Nina conditions, while 95-135 denote weak to strong El Nino conditions.
If one uses the quintile definition for (moderate or stronger) ENSO events, MEI ranks from 1-27
would denote La Nina, while 109-135 would denote El Nino.  Finally, the comparison figures on this
website refer to strong ENSO events, such as might be defined by the top 14 (one tenth or smaller)
ranks, such as 1-14 for La Nina, and 122-135 for El Nino. Actually, the comparison figures were
constructed using only cases between 1871-1949.

YEAR    DECJAN  JANFEB  FEBMAR  MARAPR  APRMAY  MAYJUN  JUNJUL  JULAUG  AUGSEP  SEPOCT  OCTNOV  NOVDEC
1871	73	69	69	88	80	36	28	46	60	76	80	57
1872	40	23	27	41	41	38	36	31	30	37	37	31
1873	26	21	14	8	22	34	37	36	49	70	53	43
1874	41	27	20	15	15	25	26	19	20	20	33	36
1875	32	37	35	24	12	5	3	8	14	23	36	35
1876	28	16	8	4	3	4	9	26	45	66	78	83.5
1877	84.5	88	92	83	92	103	121	129	131	133	133	130
1878	130	133	133	129	115	98	99	80	46	30	26	29
1879	22	32	51	48	30	15	30	39	41	41	34	21
1880	20	25	26	21	28	39	78	89	73	60	65	83.5
1881	81	83	83	71.5	60	65.5	61	43	34	47.5	44	32
1882	43	49	41	33	23	24	35	47	53	56	49	50
1883	44	39	42	40	21	28	54	57	50	71.5	73	73
1884	79	78	76	86	105	104	91	90	99	94	89	93
1885	99.5	102	88	79	99.5	93	71	79	97	104	120	109
1886	91	77	70	64	40	12	8	13	15.5	12	11	13
1887	8	7	13	20	16	26	69	78	74	61	56	64
1888	75	89	106	116	109	111	112	123	130	130	129.5	131
1889	131	131	128	121	94	64	40	18	9	10	8.5	8
1890	6	3	5	10	7.5	7	12	17	19	18	27	41
1891	45	57	81.5	81	72	79	90	88	81	74	67	61
1892	63	63	33	9	6	17	21	15	8	6	5	6
1893	5	5	6	7	1	1	1	1	1	2	3	10
1894	16	11	10	5	11	31	24	22	28	27	31	38
1895	35.5	31	30	32	34	37	59	85	93	86	77	78
1896	62	62	66.5	60	73	102	110	122	125	122	118	123
1897	127	123	119	119	110	90	72	61	51	45	54	51
1898	47	36	22	29	44.5	46	51	40	21.5	28	57	54
1899	42	35	44	56	69	83	94	112	118	112	109	114
1900	116	118	122	127	129	129	123	101	89	88	96	94
1901	97	97	80	65	65	65.5	64	72	61	49	41	47.5
1902	55	59	73	94	113	125	130	128	123	129	132	128
1903	110.5	110	116	101	62	49	46	35	42	43	32	27
1904	18	13	19	27	43	59	84	99	101	106	102	101
1905	107	111	118	123	120	123	132	132	128	126	121	118
1906	115	104	97	93	89	81	55	44	31	13	28	37
1907	30	34	36	30	24	27	43	68	76	75	52	45
1908	50	48	38	23	13	11	27	34	26	19	18	12
1909	21	42	34	28	25.5	14	6	6	5	9	8.5	7
1910	9	9	3	2	2	2	2	7	10	8	10	11
1911	17	33	43	22	7.5	8	25	64	88	93	103	107
1912	109	113	108	102	88	52	39	41	52	73	72	70
1913	70	81	81.5	43	31	50	74	87	100	95	98	105
1914	108	107	107	100	93	89	102	121	122	114	113	119
1915	118	120	112	120	127	127	111	93	84	52	35	42
1916	52	38	23	31	32	20	7	2	2	4	6	3
1917	2	2	4	6	5	6	19	23	21.5	15	12	14
1918	10	19	25	35	42	67	113	125	116	113	114	116
1919	126	128	126	118	118	119	119	119	115	105	97	82
1920	88	99	102	97	87	87	58	52	56	53	69	77
1921	74	71	39	18	33	41	38	42	38	39	50	56
1922	46	45	54	66	68	58	44	49	47	42	45	34
1923	29	40	45	44	48	68	96	110	111	110	112	110
1924	103	92	78	59	39	18.5	17	10	11	22	30	24
1925	24	29	47	62	71	74	80	111	121	127	125	126
1926	124	122	127	128	123	116	114	100	79	69	71	74
1927	72	80	84	55	49	56	49	59	77	84	92	90
1928	89	96	91	68	56	76.5	86.5	71	43	44	58	63
1929	66.5	70	60	57	74	94	101	106	107	99	95	95
1930	94	98	105	117	121	115	118	124	126	128	129.5	132
1931	132	130	131	130	125	108	93	83	78	82	85	86
1932	83	84	95	110	114	113	117	116	96	67.5	64	71
1933	69	66	53	46	50	35	32	29	23	21	24	19
1934	15	15	21	42	53	63	63	60	69	78	68	66
1935	61	56	46	45	59	78	70	69	90	90	90	92
1936	84.5	79	90	91.5	96	97	83	81	83	79	86	91
1937	90	82	85	71.5	57.5	53	53	63	80	85	81	69
1938	58	52	48	39	27	21	16	11	17	32	39	33
1939	31	26	24	26	47	75	81	95	110	101	87	89
1940	102	112	120	125	124	122	122	118	114	111	108	111
1941	121	127	129	131	132	131	126	126	127	125	128	127
1942	119	115	111	111	90	55	34	25	25	24	16	16
1943	13	18	29	47	66	91	97	75	59	50	46	53
1944	56	72	86	80	81	80	77	70	54	55	62	47.5
1945	53	51	49	50	55	73	50	37	44	71.5	84	72
1946	59	60	58	61	54	60	68	65	75	89	88	87
1947	86	76	64	54	51	61	60	45	35	36	42	49
1948	68	86	100	98	82	82	75	66	66	65	61	62
1949	77	68	57	63	79	70	42	33	36	35	25	28
1950	25	20	11	11	14	13	5	3	12	17	13	9
1951	12	17	16	34	57.5	92	106	117	120	115	107	102
1952	98	100	94	90	91	72	52	56	67	81	70	68
1953	82	91	99	104	104	99	85	91	103	97	79	81
1954	80	65	68	75	61	47	29	20.5	24	25	21	17
1955	23	24	17	13	9	3	4	9	7	3	2	1
1956	4	6	7	12	10	9	13	24	32	26	17	26
1957	34	53	72	87	106	121	127	127	124	118	116	120
1958	125	126	125	124	126	128	125	115	98	91	91	96
1959	99.5	106	110	107	107	107	100	86	85	80	75	67
1960	65	75	74	78	78	76.5	67	54	55	58.5	60	60
1961	71	73	66.5	76	84	84	76	74	68	46	43	44
1962	27	22	52	49	25.5	29	48	48	40	40	38	55
1963	54	43	50	58	70	86	98	114	117	117	115	112
1964	112	105	87	53	35	18.5	15	16	18	14	20	30
1965	38	55	62	69	97	114	124	130	129	124	126	129
1966	128	124	123	114	108	101	89	84	70	67.5	76	76
1967	60	46	31	38	44.5	40	33	28	29	33	40	52
1968	48	41	37	37	38	43	41	53	82	98	101	99
1969	106	116	117	115	119	118	115	113	108	108.5	104	104
1970	104	101	93	82	75	45	18	14	15.5	16	19	18
1971	11	8	2	1	4	10	14	20.5	13	11	14	22
1972	39	58	61	70	103	126	133	133	134	132	131	133
1973	133	129	124	106	77	44	20	12	6	7	7	4
1974	1	1	1	3	17	30	22	27	39	31	15	20
1975	37	47	40	25	20	16	11	4	3	1	1	2
1976	3	4	9	14	37	69	105	109	113	121	110	100
1977	105	103	98	96	95	95	103	108	102	108.5	111	115
1978	113	109	113	99	67	57	62	77	65	62	94	97
1979	96	90	79	77	101	100	86.5	97	109	107	106	113
1980	114	108	109	122	122	110	107	102	92	87	83	85
1981	64	54	63	85	85	71	66	62	72	83	82	80
1982	78	74	75	91.5	112	124	129	131	132	134	134	134
1983	135	135	135	135	135	134	131	120	94	77	66	79
1984	76	64	59	73	63	48	47	50.5	58	64	51	39
1985	33	30	28	36	36	42	65	50.5	37	57	74	65
1986	57	61	65	67	76	88	92	107	119	120	122	122
1987	122	125	130	132	131	132	134	134	133	131	127	125
1988	123	114	103	89	64	32	10	5	4	5	4	5
1989	7	10	15	17	19	22	23	38	48	47.5	55	75
1990	87	95	104	105	98	96	88	76	86	92	93	88
1991	92	93	96	108	117	117	116	94	87	103	123	124
1992	129	132	132	133	134	133	128	103	95	102	105	108
1993	110.5	117	121	126	130	130	120	104	104	119	117	106
1994	101	94	89	103	116	112	109	105	105	123	124	121
1995	120	121	114	113	111	106	95	82	64	54	47	46
1996	51	50	55	52	46	54	57	58	57	51	63	58
1997	49	44	56	95	128	135	135	135	135	135	135	135
1998	134	134	134	134	133	120	79	32	27	34	29	23
1999	19	14	18	19	18	23	31	30	33	29	22	15
2000	14	12	12	16	29	33	45	55	62	63	48	40
2001	35.5	28	32	51	52	51	56	67	63	58.5	59	59
2002	66.5	67	71	84	102	109	104	98	112	116	119	117
2003	117	119	115	112	83	62	73	73	91	96	99	98
2004	95	87	77	74	86	85	82	96	106	100	100	103
2005	93	85	101	109	99.5	105	108	92	71	38	23	25

Link to numerical MEI.ext values is here.

Go back to MEI.ext homepage.

```