VARIABILITE INTRA-SAISONNIERE DES PARAMETRES AGROCLIMATIQUES DANS LE BASSIN ARACHIDIER DU SENEGAL DE 1950 A 2022

This study analyzes the intras seasonal variability of agroclimatic parameters in the Groundnut Basin between 1950 and 2022 based on daily rainfall data from ten stations and five posts. The start and end dates of the rainy season were thus determined, and the length of the rainy season, seasonal rainfall accumulation, number of rainy days, and dry spells were calculated in order to assess their spatiotemporal variability and trends in relation to rainfall breaks.The results confirm that the rainy season starts in the southeast of the basin and ends in the north. Seasonal rainfall, the length of the rainy season, and the number of rainy days, are higher in the south and center, while the maximum dry spells are longer in the north (14 days). On average, the rainy season generally begins in June in the south and center and in July in the north, ending in November in the south, October in the center, and September in the north. However, since the Sahelian climate crisis of the 1970s, the rainy season has become unpredictable, with delayed starts, early ends, and shorter wintering periods.Despite a slight increase in rainfall since 2000, the improvement in agroclimatic conditions remains moderate and spatially contrasting.