The Definition of El Niño, Table 1

Trenberth, K. E. (1997) The Definition of El Niño

Bull. Amer. Meteor. Soc., 78, 2771-2777.

Table 1

Month Mean Niño 3 s(Niño 3) Mean Niño 3.4 s(Niño 3.4)

1 25.4 0.93 26.4 1.05

2 26.2 0.68 26.6 0.79

3 26.9 0.44 27.1 0.59

4 27.2 0.53 27.6 0.53

5 26.7 0.63 27.5 0.52

6 26.2 0.67 27.4 0.53

7 25.4 0.75 27.0 0.60

8 24.8 0.85 26.7 0.72

9 24.6 0.87 26.4 0.80

10 24.7 0.89 26.5 0.88

11 24.7 1.03 26.4 1.04

12 24.9 1.08 26.4 1.06

All 25.64 0.79 26.83 0.77

Month	Mean Niño 3	s(Niño 3)	Mean Niño 3.4	s(Niño 3.4)
1	25.4	0.93	26.4	1.05
2	26.2	0.68	26.6	0.79
3	26.9	0.44	27.1	0.59
4	27.2	0.53	27.6	0.53
5	26.7	0.63	27.5	0.52
6	26.2	0.67	27.4	0.53
7	25.4	0.75	27.0	0.60
8	24.8	0.85	26.7	0.72
9	24.6	0.87	26.4	0.80
10	24.7	0.89	26.5	0.88
11	24.7	1.03	26.4	1.04
12	24.9	1.08	26.4	1.06
All	25.64	0.79	26.83	0.77

Table 1 shows means and standard deviations (s) in the Niño 3 and Niño 3.4 regions for the base period 1950-79 in °C. In the last row ``All'' refers to the overall means and standard deviation of monthly anomalies.

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