The dendrogram of the two-way cluster analysis using the monthly rainfall data (thickness of horizontal black bars) classified as the El Nino years. Four clusters of years, separated by horizontal dashed lines, were extracted from this analysis (P1, P2, P3, and P4). The X-axis and Y-axis represent month and year, respectively, with the rainfall depth shown for each month.
Mean monthly precipitation of each group derived by the cluster analysis (see Figures S1 to ÂS3) for El Nino (top), normal (middle), and La Nina (bottom) conditions. Values in the legends represent the probability for every rainfall group within the broad El Nino, normal, and La Nina precipitation regimes.
Cluster analysis of 20th century rainfall in El Nino, normal, and La Nina classes.
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