Namibia extends from 17°S to 25°S: climatically the range of the sub-Tropical High Pressure Belt, arid is the overall climate description descending from the Sub-Humid (mean rain above 500 mm) through Semi-Arid between 300 and 500 mm (embracing most of the waterless Kalahari) and Arid from <answer>150 to 300 mm</answer> (these three regions are inland from the western escarpment) to the Hyper-Arid coastal plain with less than a 100 mm mean. Temperature maxima are limited by the overall elevation of the entire region: only in the far south, Warmbad for instance, are mid-40 °C maxima recorded.
What is the arid measurement in Namibia?
150 to 300 mm