Iran climate Generally Iran climate is dry and Iran is a dry land. Except for the slopes to the Caspian Sea in Alborz mountains rang,as well as the western slopes of the Zagros Mountains, which have relatively significant rainfall,the rest of the country is more or less deprived of this natural benefit and is often considered the driest region. The maximum rainfall in the northern slopes of Alborz (Gillan province) is about 2000 mm annually. In the driest areas where the central and eastern plains of the country do not exceed the rainfall of 100 mm.
In general, Iran's climate is affected by Western or Mediterranean borders. However, Western fronts are diverted from the west of the country due to their collision with the north-east and, as a result, their precipitation falls to the provinces of Azerbaijan and Ardebil and the northern slopes of the Alborz mountains, and the Iarn canvas deprive of the blessings of the rain.
Except for wet and semi-humid areas, which are the northern slopes of the Alborz and the western slopes of the Zagros, the weather in most parts of the country goes by the end of the spring, and the dry and warm season begins in the inner regions. This season will sometimes continue until the middle of the fall season. From then on, the Alborz and Zagros heights and other significant peaks of the country, slowly begin covering by the snow, followed by the winter fall, which is mostly snowy. Thus, most of the country's lands beside the plain of Khuzestan and the coastal strip of the Persian Gulf and Oman Sea sink into the snow and frost.