Savanna ecosystems of the Sahel are already heavily affected by climate change. Many subtropical dry regions are expected to become drier, leading to reduced vegetation, which may in turn amplify the initial drying (Zeng & Yoon, 2009). These ecosystems play a fundamental role in food security of the region, and an improved understanding of how they are affected by weather events is thereby critical. Several studies have shown that biomass dynamic follows the amount of rainfall (Diatta, 2021). Many factors other than rain can also play a role in the herbaceous biomass production. Among factors that influence the herbaceous biomass, some authors specify that rain is the main factor of biomass fluctuation in the Northern Sahel (Bakhoum, 2013). To conclude this, the authors did not compare climatic parameters between them, but compared rainfall to the mineral elements contained in the soil. Unlike these studies, this study aims to compare the influence of certain meteorological parameters on the herbaceous biomass production.