The historical downtown areas of "Plaza de Armas" and "Plaza de Libertad" have been restored and improved in recent years to emphasize their historic appeal, in part to encourage more heritage tourism. The Cathedral of Tampico, also known as the Temple of the Immaculate Conception, located in "Plaza de Armas", dates to the late 19th century. It has undergone several restorations. It is of the neoclassical style in light brown canter, with Corinthian-style columns and three enormous doors that form the entrance. Its two towers are made of three bodies. The eastern one has a large, London-made, public chiming clock, a gift from Don Angel Sainz Trapaga. Its recently refurbished interior holds several wall paintings and other works of art. The altar is of white Carrara marble. The United States oil tycoon Edward Doheny of California, who drilled the first oil well in Mexico near Tampico, donated substantial funds for the Cathedral's construction and maintenance after 1902, when he based his Mexican oil operations in Tampico. According to the INEGI 2010 census, the population of the city of Tampico was 297,284, and that of the municipality of Tampico was 297,554, both ranking fifth in the state of Tamaulipas. The population of the Tampico—Ciudad Madero—Altamira metropolitan area, which straddles the border between Tamaulipas and Veracruz, was estimated at 859,419 people in 2010. The municipality has an area of . Tampico has a tropical savanna climate, in the Köppen climate classification is defined as "Aw" based on the mean average temperature of 18 °C (65 °F) for January as well as on precipitation patterns. Its weather, though reasonably pleasant in spring and autumn, is hot in the summer; the average high reaches 32 °C (90 °F) in August, with an average low of 23 °C (74 °F). Winters are pleasantly cool; the average January high is 23 °C (73 °F) and the average low in January is 13 °C (58 °F). Rainfall is frequent from May through September. Tampico is an extremely humid city, with summer heat indices reaching 40 °C (104 °F). It is located on the Pánuco River and among extensive wetlands adjacent to the Gulf of Mexico.