We investigated daily rainfall data collected from 14 meteorological measurement stations in Pattani Province of Southern Thailand with respect to their spatial and seasonal variation. We propose a method, based on five-day aggregation and zero-adjusted log-transformation, that makes such data more amenable to standard statistical analysis, and we use this method to compare the patterns of variation in the data at different locations in the province. We also display methods for graphing the data using a geographical information system, and propose a new plot for simultaneously revealing patterns of variation in both area and season.