How much rain does the Arabian Desert receive each year?

Rainfall in the Arabian Desert is generally scarce, with annual averages typically falling below 4 inches (100 mm). However, precipitation levels across the region can vary significantly, ranging from 0 to 20 inches (0 to 500 mm) depending on the specific location.1

In areas beyond the influence of the Indian Ocean monsoon, rainfall is particularly limited, often averaging only 3 to 4 inches (77 to 102 mm) per year. Conversely, the monsoon can increase precipitation by fourfold or more in the southern and southwestern parts of the peninsula. While these rains are often infrequent, they can be torrential when they do occur, occasionally resulting in flash floods within the wadis. It is also not uncommon for certain areas to experience droughts that persist for several years.21