Abstract
Long records of rainfall data with good quality is a significant component that triggers the entire chain of responses in a hydrological cycle by providing useful information to hydrologist and related parties. In this study, the temporal trend analysis of seasonal rainfall data was carried out in Peninsular Malaysia using the non-parametric Mann-Kendall test. Then, the magnitude of the seasonal rainfall trend line was determined using Sen's Slope Estimator. Historical rainfall data with a minimum duration of 25 years were checked using four homogeneity tests and the missing values in the data were infilled using multiple imputation method. According to the output of the homogeneity tests, 64.3%, 7.1% and 28.6% of the rainfall time series can be categorised as useful, doubtful and suspect, respectively. From the trend test results, almost all the rainfall data were detected to have an increasing trend except Bayan Lepas for Inter-Monsoon 1, Southwest Monsoon and Inter-Monsoon 2. In addition to that, Bayan Lepas, Hospital Seremban, Ipoh and KLIA Sepang were detected to have a significant increasing trend for Northeast Monsoon as well as Batu Pahat and KLIA Sepang for Inter-Monsoon 2. In conclusion, Peninsular Malaysia exhibited increasing rainfall trend from year 1984 to 2019.
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