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Portugal climate varies according to elevation and proximity to the ocean. The heaviest precipitation occurs in northern Portugal, receiving annually about 60in (1,500 mm). Rainfall levels increases with altitude; the heaviest of which falls along the western slopes of the northern mountains that receive about 90in (2,300 mm). Precipitation decreases as you move south, and in the extreme southern area of Algarve, rainfall averages only about 15in (380 mm) a year. Summer in Portugal is long and hot and winters are moderate. The mean annual temperature north of the Douro River is about 50ºF (10°C); between the Tajo and Douro, about 60ºF (16°C); and in the valley of the Guadiana, about 65°F (18°C).
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