Thanks to mist-laden clouds that come with the Humboldt Current, there is still enough moisture for some desert vegetation to survive. These misty clouds are known as garua, and are one of the reasons for the moderate coastal climate. More inland, a few hundred metres above sealevel one will rise above the garua and the weather will be sunny all year round. Most parts of La Costa have a pleasant climate in summer, especially the northern city Trujillo. In the Andes range, La Sierra, there is a dry season from May to September.
Daytime temperatures are moderate, but it can be very cold during the nights.
While the season may be dry, it is still winter in that part of the world. Sometimes it may freeze at night in a city like Cuzco, at 3326 m above sealevel. Precipation is average in most of La Sierra, with about 800 mm rainfall during the year. Apart from the rain season the weather is usually sunny. Tropical rainforest in Manu National Park La Selva, the Amazon region and the monta a, is extremely wet.