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In page Sudetes:

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The highest mountains, those located along the Czech-Polish border have annual precipitations around 1500 mm.[1] The Stołowe Mountains that reach 919 m have precipitations ranging from 750 mm at lower locations to 920 mm in the upper parts with July being the rainiest month.[2] Snow cover at the Stołowe Mountains typically last 70 to 95 days depending on altitude.[2]