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When Charles Darwin visited the island, he is noted for saying: "In
winter the climate is detestable, and in summer it is only a little
better..." but perhaps he had too bad luck. In Chiloé one third of the
year is raining, one third cloudy and one third sunny, and these three
states may happen in a single month, a single week or a single day. It
is Patagonia. Thus, any traveler should be prepared and pack accordingly. One should bring water-proof pants and jackets if one is hiking, and must be sure to bring waterproof shoes.
The west coast is known for more wild, stormy weather as it faces the Pacific Ocean; hence it is less populated than other parts of the island but, on the other hand, it's there were the almost untouched Chiloé National Park is. The east coast is more protected by the Corcovado Gulf that runs between the island and the mainland, has many small islands and thus, weather is milder.
Between December and March, which is summertime in this region, there tend to be more tourists who are visiting these islands and sailing around the sea. Summer is also attractive because of blossoming flowers and also in town parties, or fiestas, and if you reach Quellón, at the southern end of the island, you may take a trip to see the blue whales that come to feed their offspring during these months. Spring is also appealing due to the nest time of many birds, from woods to seashore to marine species. However, Chiloé can be visited as any-time destination. It is just becoming popular, so one is not likely to feel bombarded by people at any time throughout the year.