rainforest climate, as its driest month of January averages just under of rainfall. Although its altitude is not considered very high, Bucaramanga's climate is neither hot nor cold, 22 degrees Celsius being the average temperature. Compared to cities at the same average altitude (such as Cali), Bucaramanga has much cooler daytime temperatures, owing to the cold wind coming down the eastern peaks; its night temperatures are not cold, owing to the warm air coming from the canyon. These phenomena make the daily thermal oscillation narrower than in other Colombian cities. Municipal flag The municipal flag of Bucaramanga was designed by the historian Gustavo Gómez Mejía. Made of two green stripes with a yellow one in the middle. In the center, there's a blue disk, surrounded by a red circle. In the middle of the blue disk, there's a white star. In the red circle the following legend: "Below the azure of its sky and defended by the generous blood of its sons, Bucaramanga is opened to the four horizons of the motherland" is written. Municipal coat of arms The words Montani Semper Liberi are Latin for "Mountaineers are Always Free". Demography According to the data obtained from the 2018 census and information provided by the Metropolitan Area of Bucaramanga, the city has an estimated population of 681,130 inhabitants. Of the total population, 47.5% are men and 52.5% women. The average number of occupants per household is 3.6 people. 16.6% of people of the population are 10 years of age or younger. Of all cohabiting couples in the city, 46.3% were single, 26.7% were married, 5.8% were separated and 4.6% were widowed. 9.2% of the resident population aged over 4 years are from another municipality, and 0.3% from another country. In the city, 39% of people live in houses, while 56.7% live in apartments and 4.3% in a leased room or other. Economy Industry An industrial activity developed in Bucaramanga that has gained national recognition is the footwear industry. For this reason, the Footwear Manufacturers' Association (Asoinducals) is located in the city. The footwear sector has a major market nationally and internationally in countries such as Argentina, Brazil, Canada, Ecuador, Italy, some Caribbean islands, United States, Peru, Venezuela and Mexico. There is also a big clothing industry. There are a growing number of technological research centers in various topics such as energy, gas, oil, corrosion, asphalt, leather and agro-industrial development tools,