Composite analysis is a useful method in climate studies to highlight the canonical features of a given type of variability without focusing on the differences between individual events (Rasmusson and Carpenter, 1982).
It is an analysis technique based on the terms of the probability of the event occurring, such as El Niño or La Niña event.
This study was analysis the rainfall variability on the ENSO. Composite analysis used to calculate the characteristics of various elements in the past that have been influenced by ENSO.
It can be divided into three groups: El Niño, La Niña and Normal.