The variability of the climatic system and its variables is significant at any timescale. Precipitation in the Iberian Peninsula is the variable which exhibits a higher degree of dispersion for both cumulative quantities and temporal distribution, making it an interesting subject matter (Casanueva et al., 2014; Gonzalez-Hidalgo et al., 2009; de Luis et al., 2010; Martin-Vide et al., 2006; Rodriguez-Puebla et al., 2010). The aim of this study is to understand the climatic significance of the fractal dimension applied to precipitation series at a high degree of resolution thus enabling the differentiation of regions based on the homogeneous behaviour of this indicator in the study area.