Variation characteristic of rainfall andvisibility enhances the understanding of the significance of indicated trends of variability to everyday life and factors that might be responsible for such variations. This research work critically analyses the seasonal trends between rainfall and visibility in Ilorin, Nigeria. The data used for this work was obtained from the Nigerian Meteorological services, Oshodi, Lagos State. Simple graphical method was adapted to analyze the trends of variation,

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... ng average monthly values for each parameter. The minimum value of visibility and a high value of rainfall of 0.16 km and 285.5mm respectively were recorded during the month of July and May. The results of analyses revealed that the curves on the rainfall are directly proportional to observed curves on visibility.