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Argentina's climate is as varied as its terrain, ranging from subtropical in the north to humid and steamy in the centre, and cold in the temperate south. The Andes region has erratic rainfall, flash floods in summer, searing heat, snow at higher elevations, and the Zonda - a hot, dry wind. The lowlands receive sufficient rainfall to support swampy forests and upland savanna, but rainfall decreases from east to west; shallow summer flooding is common in the east. The winter dry season is pronounced, and the summer heat can be brutal. Patagonia is mild year-round in the east and glacial in the south. Weather in Patagonia can be very unpredictable, and can change drastically and unexpectedly. Argentine Patagonia and Tierra del Fuego have summer averages of just 11°C (52°F); nighttime temperatures will most likely be in the 1°C-5°C.