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How do extreme summer temperatures affect the climate of the Mesopotamian plain?

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Map showing the Tigris and Euphrates river basin and its drainage network across Turkey, Syria, and Iraq, with color shading for elevation, major dams, canals, lakes, and boundaries with neighboring countries. The green areas indicate lower elevations along the river valleys, while higher elevations are shaded in brown and orange. A small locator map in the corner shows the basin's position within the Middle East. — Tigris-Euphrates river system The Tigris and Euphrates river basin and its drainage network.

The Mesopotamian plain experiences an extreme climate characterized by intense summer heat, with daytime temperatures occasionally exceeding 120 °F (49 °C). This heat is accompanied by very low humidity, often dropping to 15 percent, and significant diurnal temperature variations that can reach 40 °F (22 °C) between day and night.1

These conditions are driven by clear skies and the influence of the shamāl, a steady northerly and northwesterly wind that brings extremely dry air, preventing cloud formation and allowing the sun to heat the land surface intensively.2

A notable consequence of these summer conditions is the high frequency of dust storms. These storms often consist of wind-borne particles of clay and silt derived from dried-up marshes and abandoned alluvial plain fields. While dust storms occur throughout the year, they are particularly prevalent during the summer months.12