And, the result of the relationship between the Nino 3, Nino 3.4 SST index and the standardized PC of September, October and November (SON) at various lag times. shown in this table. It was found that, the highest correlation of 0.43886 and 0.48063. Indicates that, the Niño3 and Niño 3.4 SST index leads the standardized PC values in 6 lag time.