<P> In response, the United Nations Security Council passed Resolution 432 (1978), which declared that "the territorial integrity and unity of Namibia must be assured through the reintegration of Walvis Bay within its territory". </P> <P> In 1990, South West Africa gained independence as Namibia, but Walvis Bay remained under South African sovereignty, with South Africa increasing the number of troops . However, in 1992, the two countries agreed to establish a transitional Joint Administrative Authority for Walvis Bay and the Offshore Islands . The Authority was headed by two Chief Executive Officers, Nangolo Mbumba, then Secretary to the Namibian Cabinet, and Carl von Hirschberg, former South African Ambassador to the United Nations . </P> <P> In August 1993, prior to the end of apartheid, the Multiparty Negotiating Forum in South Africa passed a resolution calling for "the incorporation - reintegration of Walvis Bay and the Off - Shore Islands into Namibia ." The Transfer of Walvis Bay to Namibia Act was passed by the Parliament of South Africa that year . Following the signing of a treaty between the two countries, South Africa formally transferred sovereignty of Walvis Bay and the Penguin Islands to Namibia on 1 March 1994 . </P> <P> Walvis Bay features the very rare mild variation of the desert climate (BWn) according to the Köppen climate classification . It is caused by the rain shadow of the Naukluft Mountains and the cooling effect of the coastal sea temperature by the Benguela Current . Walvis Bay receives only 13.2 millimetres (0.52 in) average precipitation per year, making it one of the driest cities on earth . Despite its dry climate, the city is relatively humid . Average relative humidity throughout the year remains above 80% . The warmest month is February with average temperature 17.9 ° C (64.2 ° F), while the coolest months are August and September with average temperature 13.2 ° C (55.8 ° F). The diurnal temperature range is also low, averaging only 5.7 ° C (10.2 ° F). As one of the effects of manmade climate change, there has also been considerable warming at the airport in recent years . On 17 May 2015, the temperature at Rooikop near Walvis Bay International Airport reached 37.4 ° C . </P>

When did walvis bay become part of namibia