  In the Sahel region the population depends largely on rain-fed agriculture.
In West Africa in particular, climate models turn to be unable to capture some
basic features of present-day climate variability. This study proposes a
contribution to the analysis of the evolution of agro-climatic risks in a
context of climate variability. Some statistical tests are used on the main
variables of the rainy season to determine the trends and the variabilities are
described by the data series. Thus, the paper provides a statistical modeling
of the different agro-climatic risks while the seasonal variability of
agro-climatic parameters were analized as well as their inter annual
variability. The study identifies the probability distributions of agroclimatic
risks and the characterization of the rainy season was clarified.
