Caldas is also close to the most developed regions of the interior of the state of São Paulo, such as Ribeirão Preto (240 km), Campinas (160 km) and São José dos Campos (315 km). Climate The climate is characterized by dry winters and mild summers. The winter is from April to September and has an average temperature of 15 °C and rainfall of 315 mm. The summer is from October to March and has an average temperature of 21 °C with rainfall of 1,430 mm. The annual rainfall is 1,745 mm. The average annual temperature is 17 °C with record low of -6 °C and record high of 31.7 °C. Economy Known principally for its thermal baths, there are several resorts in the city. Due to its wealth in hydro-mineral resources, Poços de Caldas is also known for the quality of the soap that it produces. There are four factories in the city: Raízes, Antares, Sarandi and Terra Brasil. Poços is famous for its glass, which is known internationally. The founders of the factories were descendants of the artistic glassmakers who lived on the Island of Murano, near Venice, in Italy. In the city there are four glass factories: Ca'D'oro, São Marcos, Veneza and Bonora. The local soils are rich in minerals that yield thorium and zirconium. One rare zirconium ore, caldasite, was named for the area. The city has Brazil's first uranium-ore concentration plant, for use in the Angra Nuclear Power Plant in Angra dos Reis. Poços is also the home of one of the largest bauxite mines in the world, owned by Alcoa. Bauxite is an ore that contains at least 45% alumina, which is extracted to make aluminum. The smelting operations at Poços de Caldas have an annual capacity of 90,000 tons/year of primary aluminum. The facility is the largest aluminum-powder production facility in Latin America, and the second largest in the world. The plant has a capacity of 14,000 tonnes/year of aluminum powder and meets the market demand for ferroalloys, refractories, pigments, metallurgy, chemicals, explosives and solid fuel for rockets. The facility began production of hydrated aluminas and hard-burned calcined aluminas in 1985. The city gets most of its electricity from hydroelectric power plants, built and administrated with local resources (dimethyl ether), leading to independence from the state's power system. Tourism The city has parks, squares, gardens, and São Domingos mountain, which has trails for walking.