Description: climate:
Climate The climate of Iran is dry tropical with very hot summer and cold, with some snow, winter. Winter is normally the rainy season for the whole country.
The Desht-e Kavir Desert, south-east of the capital, is harsh, inhospitable, and very, very hot in summer. Winters are not much better, and at night the temperature can fall well below zero.
The Dasht-e Lut to the south is even worse; almost completely devoid of water from any direction and the last word in extreme aridity. The regions along the mountainous parts of the country have milder summers and colder winters.
The north-west of the country is generally the coldest and among the rainiest parts of the country. The winters in Azarbaijan and Kurdestan can be severe: temperatures sometimes fall as low as -20 oC (-4oF). Snow frequently remains until early spring, or even later in the mountains.
But the coastal regions have quite a different climate. The Caspian coast is damp all year round and provides a pleasant contrast with the dryness of plateaux, which are only a few hours away by road.
Wind is undoubtedly the most unpleasant element especially from June in the east of the country. In Mashhad there are tales of wind from Central Asia lasting for one hundred and twenty days, which in the middle of summer blow at up to 200 km / h.
The temperature can vary widely. In the summer, temperatures vary from a high of 50 o C (122o F) in the south to a low of 1o C (34 o F) in the north-west. Average winter temperature is 5.9 o C (42.6 o F), summer temperature is 37.8 o C (100 o F).
Precipitation also varies greatly, ranging from less than 50 mm (2 in) in the south-east to about 2,000 mm (80 in) in the Caspian region. The annual average is about 250 mm (10 in).
Spring (April to May) and autumn (late September to late November) are good seasons for visiting Iran. Summer is pleasant in Tehran and on the Caspian coast.
http://iranto.ca/En/index.php/about-ira ... nd-climate
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