This study deals with annual and monthly precipitation levels as observed in non-Sahelian regions of Western and Central Africa, mainly during the decades 1950 to 1980. The study is based on a set of methods concerning interpolation and cartographic representation as well as on statistical methods for detection of breaks in time series. These methods reveal a variability of rainfall regimes in the so-called humid regions of Africa that occurred in the late 1970s and at the beginning of the 1960s.L'etude presentee ici s'appuie sur les precipitations annuelles et mensuelles enregistrees dans les regions non saheliennes d'Afrique de l'Ouest et centrale, principalement durant les decennies 1950 a 1980. Elle repose sur un ensemble de methodes d'interpolation et de representation cartographique des resultats, ainsi que sur des methodes statistiques de detection de ruptures au sein des series chronologiques. Elles mettent en evidence une variabilite des regimes pluviometriques dans ces regions d'Afrique, dites humides, a la fin des annees 1960 et au debut des annees 1970.