The best month are:
Peru is known for having very stable periods of weather during the Andean Winter (May – Aug). The remainder of the season is dominated by the rainy season.
While climbing and trekking in Cordillera Blanca you will encounter a wide range of temperatures; from freezing nights, to snowy and windy conditions, to bright sunshine intensified by the high altitude. In one day you may experience temperatures below zero, then daytime highs of 50-70ºF range with intense solar radiation. You will need everything from shorts and a t-shirt for your time in the town of Huaraz to being fully clothed in down expedition jackets on summit day. This wide fluctuation in temperatures makes it important to bring everything on the equipment list.
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