  Atmospheric mean temperature T_m, is a vital parameter in the evaluation of
precipitable water vapor (PWV) through the analysis of GPS signal, it is,
therefore, important to have a good way of evaluation of T_m for the eventual
accurate evaluation of PWV using GPS. Simple statistical models exist for
various regions of the world for the evaluation of T_m using surface
temperature T_s, in the form T_m=aT_s+b where a and b are constants. For West
Africa, where atmospheric data is usually very scarce, there is a minimal
attempt at finding a statistical model for T_m, as a function of T_s. In this
work, attempt has been made to find such a model using data from the Climate
Monitoring Satellite Facilities (CM-SAF) of the European Meteorological
Satellites (EUMETSAT). The model derived was found to compare well with that
obtained using radiosonde data with root-mean-square error of 1.189 and
mean-biased error of 0.0952 between the two models.
