The Kraków-Częstochowa Upland, also known as the Polish Jurassic Highland or Polish Jura (Polish: Jura Krakowsko-Częstochowska), is part of the Jurassic System of south?central Poland, stretching between the cities of Kraków, Częstochowa and Wieluń.
The Polish Jura borders the Lesser Polish Upland to the north and east, the foothills of the Western Carpathians to the south and the Silesian Upland to the west. The Polish Jura consists of a hilly landscape with Jurassic limestone rocks, cliffs, valleys and vast limestone formations, featuring some 220 caves.The relief of the upland developed since the Paleogene, under climatic conditions changing considerably.
The Vistula (/?v?stj?l?/; Polish: Wisła ?viswa) is the longest and largest river in Poland, at 1,047 kilometres (651 miles) in length.
Kraków has an oceanic climate (Cfb) according to the Köppen climate classification system, one of the easternmost localities in Europe to do so.A mere 100 km (62 mi) north-east of Kraków (east of Tarnów, and north of Kielce), the January mean dips below ?3 °C (27 °F) and thus becomes continental (Dfb) in nature. The Kraków climate is also influenced by its far inland position, with significant temperature differences between seasons. Average temperatures in summer range from 18 to 19.6 °C (64 to 67 °F) and in winter from ?2.0 to ?0.6 °C (28 to 31 °F).
In summer temperatures often exceed 25 °C (77 °F), and even 30 °C (86 °F), while winter drops to ?5 °C (23 °F) at night and about 0 °C (32 °F) at day; during very cold nights the temperature can drop to ?15 °C (5 °F).Since Kraków lies near the Tatra Mountains, there are often occurrences of halny blowing (a foehn wind), causing temperatures to rise rapidly, and even in winter reach up to 20 °C (68 °F).Źródło: https://en.wikipedia.org/wiki/Krak%C3%B3w#Climate.