meters. The main topographic feature is the Cerro Quitasol (pyramidal mountain, 2,880 meters above sea level), located north of the city and considered by its grandeur as the tutelary hill of Bello. Climate The city, being located in the tropics, does not experience climatic changes. The average rainfall is 1347 mm., The temperature is determined by climatic zones ranging from desert, through cold up to medium where he is the highest, which has an average temperature of 25.7 °C throughout the year, alternating between dry and wet periods and is cooled by winds that blow along the valley throughout the year. Additionally the area receives trade winds that blow from the lower valleys of the Cauca river to the west and the Magdalena river to the east and middle, creating a dense layer of warm air, which causes the lower part of the town and some surrounding areas to increase in humidity and increase barometric temperature. As a result of the wind, northern municipalities such as Bello, Copacabana, Girardota and Barbosa are warmer than the Antioquia capital of Medellin, despite its proximity. Demographics According to figures from the 2005 DANE census, Bello has 371,973 inhabitants. It is the second largest city in the metropolitan area of the Aburrá Valley, altogether totaling 3,312,165 people. The municipality has a population density of about 2496 per square kilometer. 47.1% of the population are male and 52.9% are female. The literacy rate in the population over 5 years of age is 92.9%. Public services have high coverage, since 96.9% of households have electricity service, 96.4% have water service and 91.4% have telephone communication. According to figures from the Government of Antioquia based on the 2004 Quality of Life Survey, the prevailing socioeconomic strata in the municipality is 2 (low) with 39.3%, followed by the strata 3 (medium-low) at 36.1% then strata 1 (low-high) with 20.2%. In a smaller proportion are also strata 4 (middle) and 5 (medium-high) with 4.3% and 0.1% respectively, which are mainly rustic houses located on the sidewalks of the municipality. Ethnography According to figures from the DANE 2005 census, the ethnographic composition of the municipality is: Mestizos & Whites: 92.2% Afro-Colombians: 7.7% Indigenous: 0.1% Politico-administrative structures Bello is governed by a democratic system based on administrative decentralization processes generated by the Political Constitution of Colombia, 1991. The city is governed by a mayor (executive power) and a Municipal Council (legislative