Abstract
Matabeleland North is, during the dry season (April–Sept.), one of the driest regions in Zimbabwe. However, the relative air humidity remains large, which makes dew an interesting potential supplementary source of water. In this paper, one reports an estimation of dew over one year i.e. between 29 May 2020 and 28 May 2021 by using an energy equation and meteorological data extrapolated from the Joshua Mqabuko airport. The calculation was validated by measurements between 1 June 2020 and 21 July 2020 performed on cars used as standard dew condensers. Rain is also considered to determine the dew/rain ratio. It follows from this study that during the dry season, dew is relatively abundant (8.66 mm) and amounts to nearly 40% of rain (22.6 mm). However, dew becomes rare at the end of the dry season (Aug.–Sept.). Dew events are frequent (dry season, typically 1.4 days without dew events; rainy season, 2 days), in contrast to rainfall (dry season, typically 32 days without rain events and erratic; rainy season, 4.1 days). Dew can thus provide a noticeable and reliable supplementary source of water during most of the dry season.
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