3.2.4. Analysis of Climatic Data: Rainfall

To better understand the factors of evolution and transition of agricultural land in the Groundnut Basin, we have analyzed the inter-annual evolution of rainfall over the period from 2009 to 2018. Indeed, Senegal has two main seasons that mark the climatic regime: a dry season from November to April–May, and a rainy season from May–June to October, depending on the geographical location [41]. Accordingly, the rainfall values used in this analysis only concern the period from June to October, which coincides with the rainy season in our study area [71]. The methodology adopted is based on a statistical approach, using the averages of the five months of rainfall for each year in the series.
