of unevenness. The municipality is at an altitude of above sea level, and located in a geographic region called the São Paulo State Peripheral Depression, near the border with the Western Plateau, in an area of basaltic cuestas. Águas de São Pedro is located in the so-called Piramboia Formation (Piramboia means "snake fish" in Tupí–Guaraní), one of the five stratigraphic subdivisions of the Paraná Basin, all formed at different periods, in which Triassic and Early Cretaceous ages sediments predominate. The sediments are composed of thin to medium arenites, white-orange to reddish in color, and with tangential cross-bedding in a mid-size to large base; these features are indicative of temporary rivers in the past in a semiarid environment. The city is situated in the central part of the Medium Tietê Zone, which occupies about , or two-fifths of the total area of the Peripheral Depression. It is bounded by Araquá River (Araquá means "hole of the world" in Tupí–Guaraní), which has a general north–south route, and also by the Limoeiro and Das Palmeiras lakes. The region where Águas de São Pedro is located is also part of the watershed of the Piracicaba River. The Piracicaba basin extends over an area of , covering the southeastern state of São Paulo and the southern end of Minas Gerais. Climate According to the Köppen climate classification, Águas de São Pedro has a tropical savanna climate (Aw), close to the humid subtropical climate (Cfa), with a decrease in rainfall during winter, an annual average temperature of , dry and mild winters (with occurrence of light frosts on a few days of the season), and rainy summers with high temperatures. The hottest month, February, has an average temperature of , with an average maximum of and a minimum of . The coldest month, July, has an average temperature of , with and being the maximum and minimum averages, respectively. Fall and spring are transitional seasons. The total annual rainfall is measured at , and July is the driest month, with of precipitation. In January, the wettest month, the average is . Since the early 2000s, however, hot and dry days during winter have been increasingly frequent not only in Águas de São Pedro, but also in much of the state of São Paulo, often surpassing , especially between the months of July and September. During the dry season and in the long veranicos in the middle