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Climate

Luanda has a hot semi-desert climate (Köppen: BSh), bordering upon a hot desert climate (BWh). The climate is warm to hot but surprisingly dry, owing to the cool Benguela Current, which prevents moisture from easily condensing into rain. Frequent fog prevents temperatures from falling at night even during the completely dry months from May to October. Luanda has an annual rainfall of 405 millimetres (15.9 in), but the variability is among the highest in the world, with a co-efficient of variation above 40 percent. The climate is largely influenced by the offshore Benguela current. The current gives the city a surprisingly low humidity despite its tropical latitude, which makes the hotter months considerably more bearable than similar cities in Western/Central Africa. Observed records since 1858 range from 55 millimetres (2.2 in) in 1958 to 851 millimetres (33.5 in) in 1916. The short rainy season in March and April depends on a northerly counter current bringing moisture to the city: it has been shown clearly that weakness in the Benguela Current can increase rainfall about sixfold compared with years when that current is strong.