Chile Guide
Weather
The north of the country can be comfortably visited at any time of year, though if you're planning to rent a 4WD and tour the altiplano, note that the unpredictable weather phenomenon known as the Bolivian Winter (or invierno altiplánico) can produce heavy, sporadic rainfall between December and February (the height of summer), washing away roads and disrupting communications.
In the centre and south of the country, you should avoid the months of June to September (unless you plan to go skiing), when heavy snowfall often blocks access to the mountains, including many national parks. The peak summer months are January and February, but as accommodation rates and crowds increase in equal measure, you'd be better off coming in November, December or March, when the weather is often just as good.