section_path: Geography/Climate
section_name: Climate
paragraph_text: Climate
  
  Iran's climate is diverse, ranging from arid and semi-arid, to subtropical along the Caspian coast and northern forests. On the north edge of the country, temperatures rarely fall below freezing and the area remains humid. Summer temperatures rarely exceed 29 °C (84.2 °F). Annual precipitation is 680 mm (26.8 in) in the east part of the plain and more than 1,700 mm (66.9 in) in the west part. The UN Resident Coordinator for Iran, has said that " Water scarcity poses the most severe human security challenge in Iran today".
  
  To the west, settlements in the Zagros basin experience lower temperatures, severe winters with freezing average daily temperatures and heavy snowfall. The east and central basins are arid, with less than 200 mm (7.9 in) of rain and have occasional deserts. Average summer temperatures rarely exceed 38 °C (100.4 °F). The southern coastal plains of the Persian Gulf and Gulf of Oman have mild winters, and very humid and hot summers. The annual precipitation ranges from 135 to 355 mm (5.3 to 14.0 in).