The main propagation effect on interference between a satellite system and an adjacent terrestrial path is considered to be the differential rain attenuation. In the present paper, a predictive method for the differential rain attenuation statistics is presented based on a convective raincell model and the assumption that the point rainfall statistics follows a gamma form. This is valid for various climatic zones of the world, such as J, M, N, P, Q zones. The results of the predictive procedure are compared with the only available set of experimental data taken from Yokosuka, Japan. The sensitivity of various parameters affecting the differential attenuation statistics is also examined.