Climate of country varies greatly due to features of relief and global location. Northern portion of Iran has subtropical weather conditions while climate of south is tropical. Central regions are lying within the zone of continental and mountainous weather. Coasts of Persian and Oman Gulfs are hot and humid with winter averages between 16 and 18 °C (61-64 °F). At summer temperature there ranges from 24 to 30 °C (75-86 °F). Annual amount of precipitation is significant and varies from 600 mm (23.6”) in plains to 1000 mm (39.3”) on mountain slopes.