Why does Salalah have a more temperate climate than northern Oman?

Salalah experiences a more temperate climate than northern Oman primarily because the Dhofar region is influenced by the summer monsoon.12

While northern coastal areas, such as Muscat, endure intense heat and high humidity with summer temperatures frequently reaching 110° F (43° C), the monsoon winds provide a moderating effect on the weather in Ṣalālah.12