Between 800m and 1,400m, the average annual temperature varies from 9 °C to 13 °C, with a summer high of 28 °C and winter low of -3 °C. Average annual precipitation is between 500 and 800 mm, predominately in non-summer months. At this elevation, much of the precipitation falls as snow, between December and February, although there are always exceptions, and the snow rarely remains unmelted for more than three days. It is in this region that all cities and the majority of people live; this also means that of all distinguished elevations, it is the most susceptible to damage from human traffic and intrusion.