For decades, wind-driven rain studies have been performed in multiple regions to characterise the façade exposure to rainwater penetration. These studies have been invariably conditioned by the exhaustiveness of the available climatic records, traditionally providing scalar exposure results based on the Driving Rain Index. It is only recently that accurate directional analyses have begun to be developed by using, where available, hourly climatic records according to standard ISO 15927-3. Consequently, most countries still lack an accurate characterisation of the most unfavourable exposure that can occur on their building façades. This work presents recent advances and new contributions that allow a novel reinterpretation of the traditional wind-driven rain studies, identifying these exposures from the scalar characterisation already available.