Lo Barnechea has in the semi-arid
Mediterranean climate in a similar fashion to the rest of the
Metropolitan Region, characterized by a prolonged dry season and a winter season, which concentrates annual rainfall. •
Annual rainfall 360 mm •
Average temperature 14 °C •
Average Maximum Temperature 22 °C •
Average Minimum Temperature 7 °C The climatic patterns present very important variations due to its location as a foothill area, which subjects it to the effects of altitude. It is estimated that in a mountainous environment, rainfall increases by about 22 mm every 100 m of altitude, while the temperature decreases by about 0.5 °C every 100 m. Due to this, being the urban area of the town of Lo Barnechea located at 850 m a.s.l. and above the rest of Santiago, it receives 65 mm more rainfall than in the
commune of Santiago in the center of the city. This varies due to the size of the rural territory of the commune. In the annual distribution of rainfall, and considering the entire mountainous area, when it rains several days in a row, large flows are produced in the riverbeds, which causes flooding by accumulation and its subsequent transfer to the slopes. The topography of the
Mapocho River and its location, means that these climatic event will need to be taken into account in planning the future population distribution of the Commune.
Flood of 1982 The Flood of 1982 occurred with the incursion of warm winter fronts causing a rise in the lower limit of the snowpack, from 1800 to 2400 meters above sea level, generating a large increase in the volume of water and sediment runoff as a result of the melting of the snow, which caused saturation and subsequent overflow of the natural and artificial water drainage systems. The impact of this flood were tragic and disruptive, with loss of life, interruption of activities and damage to infrastructure and equipment, due to the permanence of inhabitants on the banks of the Mapocho River. The repetition of a similar event, under the current conditions of occupation and urban expansion in Lo Barnechea, could cause an even more catastrophic event, due to the high degree of intervention and modification of the natural system as a result of the construction development that continues to take place on increasingly higher ground. == Education ==