CLIMATE

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Abstract
Iran is unfortunate in having recorded no long-term climatic observations. Hence, a great deal of attention was focused on Iran's agricultural potentialities, the assessment of which required adequate knowledge of climatic conditions. The climate of Iran is influenced by many centres of high pressure as well as a number of low pressure centres. In a country like Iran having extensive flat deserts, highly complex mountain systems, topography is a major modifying factor and surface winds are greatly influenced by local topographical features. The country has five temperature zones, namely, the Caspian zone, Persian Gulf zone, Zagros zone, Alburz zone, and the interior zone. Over Iran, it can be said that precipitation decreases from north to south and from west to east, except where relief of the land upsets the regularity in this arrangement. The mean annual precipitation for the entire country is 400 mm.

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