Abstract
Air and soil temperatures were observed during the period from September 2012 to August 2013 around Cerro Charquini (5392 m a.s.l.) in Bolivian Andes. According to the results, diurnal freeze-thaw cycles in air temperature appeared almost throughout the year. On the other hand, a frequency of the cycles in soil temperature was remarkably high during the dry season from April to October but extremely low in the rainy season from November to March. Therefore, freezing and thawing process in this area is not effective in the development of periglacial landforms.