Sierra: Due to its proximity to the Equator, day and night are of equal length in Peru, both in summer and winter. Around Christmas, El Niño often causes floods.
The landscape of the Sierra is characterized by impressive, partly snowcapped, valleys and plateaus. Winters, from May to October, are sunny and dry. Nights can be frosty at altitudes above 3000 meters. Days are never as hot as on the coast.
Highlanders always wear large trousers or their traditional multi-layered skirts, or ‘polleras’.
Summer is the rainy season. Heavy rainfall can then shift into violent thunderstorms that can cause ‘huaycos’ or landslides. When this occurs, large parts of the Sierra are cut off from the rest of the world.
Eternal ice can be found above 5000 meters. Unfortunately, the effects of global warming are already present. Scientists believe all of the ice will have melted in thirty to fifty years.

Selva: The Selva is the least populated region of Peru, although this rugged land takes up about 60 % of the territory. Here, the weather is humid and tropical all year long, with an average temperature of about 26 degrees. True to its name, the rainforest has 200 rainy days per year.