Peru’s climate varies considerably by region, although the months of January through March are the wettest in the highlands (Cuzco). Coastal areas are hot and humid during those months, but are cooled during the rest of the year by the fog from the ocean known as La Garúa. The western slopes of the Andes are clear, warm, and dry most of the year. Up in the mountains, the temperature drops considerably at night. The eastern slopes of the Andes and the Amazon basin get very heavy rainfall during their wet season, which lasts from January through April.