Five Times:Has that ever happened before?
- 1892 - 1894
- 1908 - 1910
- 1954 - 1956
- 1973 - 1975
- 1998 - 2000
 
					
				Ensemble Oceanic Nino Index
Figure 1. December 1877 Tropical Pacific sea surface temperature anomalies via HADISST2.1
				
					
						
					
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