Resumen
In this work, the set of annual pluvial precipitation patterns obtained in 57 weather stations from the southern part of baja california peninsula (mexico) during more than 20 yeras is presented. Three distinctic periods are readily recognizable from the annual mean pattern stand point of view, as follows: period I corresponding to the dry season from March to June; period II corresponding to the rainy season from July to October; period III corresponding to the rainy season from November to February. A regionalization was obtained from the rainy regime based on the relative weight of both rainy periods, merked along the mean physiographical climatological zonal features, that in general terms correspond to the climatic zonation obtained by several authors based on different data sets.