Next past The result of the relationship between the Nino 3,Nino 3.4 SST index and the standardized PC of June, July and August (JJA) at various lag times. shown in this table. The highest correlation of 0.33676 and 0.43832 indicates that the Niño3 and Niño 3.4 SST index leads the standardized PC values by 3 month.