Lake Titicaca's climate and weather is largely influenced by its altitude as well as 'El Niño' which is known to cause serious droughts in the area. It experiences a generally pleasant and sunny climate throughout the day, especially from February to November, but the cool wind off the lake can make for some very chilly nights. The maximum average temperature in the northern Altiplano ranges from around 59F to 63F (15C to 17C) during the day while the nights are much colder averaging 33F (0.5C) in summer and (-10C) in winter at night. The average year-round temperature is 53F (12C) and most rainfall occurs during midsummer in December and January.