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File: surfacetemp_avg_central_tropical_pacific_1x1_1000.png

File name: surfacetemp_avg_central_tropical_pacific_1x1_1000.png
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Alternate Text: line graph showing historical 30-year average Niño-3.4 index
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line graph showing historical 30-year average Niño-3.4 index

Image caption

Thirty-year average periods that NOAA is using to calculate the strength of historic El Niño and La Niña events. Climate.gov figure from ERSSTv5 data, based on CPC original.