The Andes shelter the largest variety of climates in the country. The climate is semi-arid in the valleys and moist in higher elevations. Rainfall varies from 200 to 1,500 mm per year. The rainy season starts in October and ends in April.
The western slopes are arid to semi-arid and receive rainfall only between January and March. Temperatures vary between 5 and 15 °C in the night versus 18 to 25 °C in the day.
Between 2,500 and 3,500 meters the temperatures vary from 0 to 12 °C in the night and from 15 to 25 °C during the day. At higher elevations from 3,500 to 4,500 meters, the Puna ecoregion, the temperature varies from −10 to 8 °C during the night versus 115 °C during the day. The northernmost regions of the Andes around
Cajamarca and Piura regions have Paramo climates.
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