COULIBALY Léréyaha^1,, OUATTARA Ismaïla¹, YAO Kouadio Assemien François¹, OUEDRAOGO Moussa¹, DIALLO Seydou DAO Amidou², SORO Gneneyougo Emile², KAMAGATE Bamory²

This study investigates the variability of climatic parameters, specifically rainfall, in the Mountain District of Côte d’Ivoire. It utilizes satellite-based rainfall data spanning from 1961 to 2020, complemented by observational data from SIEREM (Système d'Informations Environnementales sur les Ressources en Eau et leur Modélisation) database for the period 1961–2000. A preliminary processing of the rainfall datasets was conducted to correct biases and address data gaps. The methodological framework combines statistical change-point detection tests (Cusum (Cummulative Sum) and Student’s t-test) with trend analysis techniques (Mann-Kendall and linear regression). Results from the change-point tests indicate no statistically significant discontinuities in the rainfall time series. However, trend analyses suggest a non-significant overall decline in precipitation across all monitoring stations. Notably, a marked reduction in monthly rainfall totals during May and June was observed, potentially offset by increased precipitation from August to October. Decadal analysis of annual cumulative rainfall over six decades reveals that precipitation consistently exceeded 1,000 mm, except at the Kouibly and Semien stations, where totals ranged from 922 mm to 981 mm during the decades 1971–1980, 1991–2000, and 2011–2020. Spatial analysis of rainfall isohyets highlights a heterogeneous distribution across the district, with rainfall patterns exhibiting an East–West gradient.

rainfall variability, mountain regions, precipitation trends, Côte d’Ivoire