What is the temperature in Peru in winter?

Some provinces in central and southern Peru have entered winter ahead of schedule. The sudden drop in temperature has caused some infants and young children to become sick and die, and some livestock have been frozen to death and frostbitten. According to the local meteorological department, the temperature in Tacna Province has dropped by 5 to 6 degrees Celsius in recent days. The temperature in the plateau areas of the province has dropped below zero degrees Celsius, and the temperature in some high mountain areas has even dropped to minus 23 degrees Celsius. In addition, parts of the provinces of Cusco, Junin and Pasco are seeing an increasing number of people suffering from respiratory diseases due to a sudden drop in temperatures.

From this we can see that the statement about going upstairs is obviously wrong. To be precise, it is -35℃～-5℃