Or, more precisely, the distance between the ground and the center of the eyeball. But assuming the earth were a perfect sphere: Average radius of earth = 6,372,797 meters Draw a circle representing the earth.
As a result, the Namib receives an average annual rainfall of only 2.5cm (1in). The sand dunes of the desert receive moisture from the atmosphere, in the form of fog. Every 10 days or so, a dense night fog rolls inland for a distance of 80km (50mi) or more, shrouding the coast and much of the desert. The fog condenses into a thick dew, creating an annual average of 4cm (1.6in) of moisture. Temperature in the Namib reaches a high of 66Â°C (150Â°F) in the middle of the day. Gravel and rock plains extend north from the Kuiseb River. The treacherous coastal waters of this region regularly snare ships, such as the Dunedin Star (1942) and the Shawnee (1976), and cast them up on the shifting sands.
The average temperature of 16 C on the Namib coast is among the lowest in a tropical altitude anywhere in the world. On the central coast, fog forms on 146 days of the year. Surface sea temperatures average 13 to 15 C in winter and 15 to 17 C in summer.he rainy season, such as it is, is of short duration. The average number of rainy days in a year, days with rainfall of 1 millimetre or more, do not exceed 50 anywhere in Namibia. In most of the country, east of the Namib, the total is 15 to 40 days. In the desert rain falls, on average, on only 5 to 15 days in a year.