MEI Ranks (last update: 8 September 2016)

Bimonthly ranks of the MEI, since the beginning of record in Dec1949/Jan1950. If two MEI values are
identical within the same bimonthly season, their rank is split between them, leading to a ".5" value. 
Missing values are left blank.  

How can one interpret these ranks?  Given that there are 67 numbers in each column, the lowest
number (1) would denote the strongest La Nina case for that bimonthly season, while the highest
number (66 or 67) 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.

If we use percentiles (say, 30%ile) to define La Nina, near-normal, and El Nino, MEI ranks from 1-20
denote strong to weak La Nina conditions, while 47-66 (48-67) denote weak to strong El Nino conditions.
If one uses the quintile definition for (moderate or stronger) ENSO events, MEI ranks from 1-13
would denote La Nina, while 54-66 (55-67) would denote El Nino.  Finally, the comparison figures on this
website refer to strong ENSO events, such as might be defined by the top 7 (upper decile)
ranks, such as 1-7 for La Nina, and 60-66 (61-67) for El Nino.

YEAR    DECJAN  JANFEB  FEBMAR  MARAPR  APRMAY  MAYJUN  JUNJUL  JULAUG  AUGSEP  SEPOCT  OCTNOV  NOVDEC
1950	11	11	6	7	3	5	5	10	14	21	9	6
1951	10	9	8	19	19	40	47	54	48	49	47	44
1952	46	38	36	37	21	11	21	20	39	40	24	33
1953	37	44	45	57	54	36	39	37	44	34	36	38
1954	35	37	42	17	4	2	4	5	10	7	10	10
1955	15	16	9	3	1	1	1	1	3	3	1	1
1956	4	6	5	6	5	3	6	9	7	5	14	11
1957	14	27	40	42.5	57	47	55	60	60	59	57	59
1958	62	61	61	61	51	52	50	43	34	38	41	50
1959	48	52	50	36	29	31	29	33	32	29	27	28.5
1960	30	30	31	28	20	19	20	26	21	23	26	24
1961	34	29	30	30	22.5	24	24	24	25	19	21	17
1962	9	12	15	9	9	8	13	14	19	18	18	23
1963	16	14	17	15	14	26	42	45	49	50	52	51
1964	54	46	24	18	6	7	3	4	8	9	8	13
1965	22	28	23	32	44	55	61	62	61	60	62	60
1966	61	59	52	51	24	22.5	28	35	31	30	35	30
1967	26	13	11	8	15	18	15	19	16	17	22	25
1968	19	15	19	11	7	9	14	31	36	43	45	40
1969	50	54	47	54	50	50	43	38	33	45	46	42.5
1970	44	45	44	27	26	13	10	11	9	11	13	7
1971	5	3	1	1	2	4	7	8	6	6	6	12
1972	20	25	25	23	43	59	64	64	62	63	63	63
1973	63	62	55	50	27	10	11	6	4	4	4	2
1974	1	1	2	2	8	12	12	13	15	12	7	16
1975	23	20	14	12	10	6	2	2	2	1	2	3
1976	3	4	7	5	13	39	46	49	58	52	42	45
1977	47	40	39	53	38	42	52	50	52	55	54	52
1978	53	55	57	35	17	15	18	27	24	31	37	42.5
1979	49	43	33	39	41	41	40	47	51	48	48	53
1980	51	50	53	58	58	53	51	40	37	39	39	36
1981	33	34	48	56	34	30	31	32	35	35	33	32
1982	32	35	37	29	42	56	62	63	63	64	65	66
1983	67	67	67	67	67	66	63	61	43	33	29	31
1984	28	24	41	41	32	27	30	28	29	32	25	19
1985	21	22	16	20	11	25	27	22	20	28	31	27
1986	29	32	35	24	39	38	41	53	59	54	53	57
1987	60	60	63	63	65	64	65	65	64	62	59	61
1988	56	51	49	42.5	31	14	9	7	5	8	5	5
1989	7	7	12	14	16	20	17	16	26	25	32	37
1990	39	49	58	46	48	43	33	34	41	41	40	41
1991	41	41	46	47	53	60	57	57	50	56	58	62
1992	64	64	65	65	64	63	56	44	45	47	44	48
1993	52	58	59	62	63	62	60	58	57	58	51	46
1994	43	39	43	48	47	48	53	52	56	61	60	58
1995	59	57	56	49	46	44	35	30	23	20	20	22
1996	18	23	26	22	25	33	25	21	22	24	30	26
1997	25	21	27	52	60	67	67	67	66	66	66	65
1998	66	66	66	66	66	61	38	23	17	15	12	14
1999	8	10	13	10	12	16	16	12	12	13	15	8
2000	6	8	10	21	35	29	26	29	27	22	17	21
2001	24	18	20	26	36	32	36	41	28	26	28	34
2002	36	33	28	45	56	54	48	56	55	53	55	56
2003	58	56	54	44	30	34	34	39	42	46	43	39
2004	42	42	32	40	45	37	45	48	46	44	50	49
2005	40	53	60	55	55	46	44	42	38	27	23	20
2006	27	26	21	16	28	45	49	51	54	51	61	54
2007	55	48	38	31	37	21	22	18	11	10	11	9
2008	13	5	3	13	18	35	32	25	18	16	19	18
2009	17	17	18	25	40	49	58	59	53	57	56	55
2010	57	63	62	59	49	17	8	3	1	2	3	4
2011	2	2	4	4	22.5	28	23	15	13	14	16	15
2012	12	19	22	34	52	51	59	46	40	37	38	35
2013	38	36	29	33	33	22.5	19	17	30	36	34	28.5
2014	31	31	34	38	59	57	54	55	47	42	49	47
2015	45	47	51	60	61	65	66	66	65	65	64	64
2016	65	65	64	64	62	58	37	36

Next update: 8 October 2016

Link to numerical MEI values is here.

Go back to MEI homepage.