on a synoptic scale, the most important factors that control the climate in chile are the pacific anticyclone, the southern circumpolar low pressure area, the cold humboldt current, the chilean coast range and the andes mountains. despite chile's narrowness, some interior regions may experience wide temperature oscillations and cities such as san pedro de atacama, may even experience a continental climate. in the extreme northeast and southeast the border of chile extends beyond the andes into the altiplano and the patagonian plains, giving these regions climate patterns similar to those seen in bolivia and argentina respectively.