This study examines the statistical behavior of monthly rainfall over a forty-one-year period (1981-2021) across five Southwestern Nigerian states: Ogun, Ondo, Oyo, Osun, and Lagos to determine the most suitable probability distribution for modeling rainfall variability. Descriptive statistics revealed mean monthly rainfall ranging with standard deviations, indicating moderate variability. Skewness values and negative kurtosis confirmed that the rainfall data are slightly right-skewed and platykurtic, characteristic of tropical precipitation. The Gamma distribution was fitted to the rainfall series using three estimation techniques
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