*3.1.3 Rainfall*

This factor also plays a role in mosquito ecology as it increases the availability of surface water and so more breeding sites and affects relative humidity and hence longevity of the adult mosquito [6]. There is relatively lower temperature but higher relative humidity. Biting intensity of mosquito reduces as rainfall reduces and can be suspended at low temperature. Rainfall also determines the type of predominant malaria vector species. For example, *An. arabiensis* prevails in the dry season, while *An. gambiae sensu stricto* (ss) is a rainy season vector [8, 9].
