<p>Historical data provides valuable insights into past climate patterns, offering lessons that inform present actions and help shape future decisions. Climate variability is influenced by natural oscillations over short and long timescales and human-induced factors. Understanding these influences is essential for improving sustainable water resource management. However, there can be a tendency to overlook past climate events, which may lead to inadequate preparation for recurring weather patterns. To illustrate this, we discuss rainfall associated with the negative Indian Ocean Dipole and La Niña events in Australia. Neglecting the historical significance of these periodic phenomena, combined with reliance on forecasting methods that fail to integrate both natural variability and human-driven changes, has, in some cases, resulted in resource mismanagement and property damage. This study advocates for using historical data to enhance the accuracy of future rainfall forecasts, with prediction methods that are continuously validated against both past and present climate data. </p>