3. Kingdom of Saudi Arabia – 59 mm/year
Being that Saudi Arabia is located in the Arabian Desert, it is no wonder that it got on our list of countries with the lowest rainfall. In the southern part of Saudi Arabia is Rub’ al Khali, the largest contiguous sand desert in the world that is also a part of the larger Arabian Desert. Summer temperatures can reach as high as 129 °F (54 °C). The Asir region is the only part of Saudi Arabia that is not in a desert climate and it gets an average of 300 mm of rainfall in a period from October to March, thanks to Indian Ocean monsoons. The city of Ras Al-Khair has the largest desalination plant in the world, which is able to deliver 1.025 million cubic meters of desalinated water annually.
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