The Amazon Rainforest is thought to be the oldest tropical forest area in the world, perhaps as much as 100,000,000 years old. The River stretches more than 4,000 miles and the tropical rainforest of its watershed is home to the world's highest levels of biodiversity. The Amazon River carves a path through South America, from the cold Peruvian Andes to the tropical Atlantic coast. Its basin covers 2.3 million square miles, draining more fresh water than any other system in the world. The Amazon's climate is heavily influenced by its tropical location. This gives it a warm temperature and plenty of rain. In this region, the sun shines approximately the same amount of time every day and so there is little variation in temperatures. The Amazon (basin, rainforest, and river) are located within the tropics. This is why the Amazonian forest, is properly called a tropical rainforest. In the Amazon region, there are basically two seasons: a rainy season and a not-so-rainy season. In the rainy seasons, one can expect up to 60-180 inches. In the "dry" season, one can expect anywhere from 30 inches to 100 inches. Some spots along the basin average more or less than others. Generally, the north and south edges of the basin have less than the western edge.

The climate that you should expect then is rain and possibly more rain. Temperatures are usually in the high 80's - low 90's but the humidity remains high so it feels more like 100°F. However during the southern hemisphere winter months (June-Ago) there are cold fronts that travel up north engulfing the amazon basin and dropping the temperatures occasionally to below 70°F. This phenomenon is called by the locals as "heladas" ("the freezing") and affects mainly wildlife. Such climatic event is usually brief and should not affect any travel (or survival) plans. To check a 15 day forecast of the region visit www.accuweather.com and enter for the location in the search fields: Tabatinga, Brazil - South America.
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Facts: The Amazon Rainforest is thought to be the oldest tropical forest area in the world, perhaps as much as 100,000,000 years old (cited from www.natzoo.si.edu/Animals/Amazonia/Facts/basinfacts.cfm) ©Smithsonian)