50–90 days a year. The vegetation period of the highest parts of the mountains is two weeks shorter than in Warsaw and is about 200 days. Temperature inversion occurs – the temperature on the heated slopes can be up to 5 °C higher than in the bottoms of the valleys, located several dozen meters below. Nature conservation In order to protect unique values of Świętokrzyskie Mountains Świętokrzyski National Park was established in 1950. Moreover, many areas are protected by several nature parks, reserves and Natura 2000 areas. Nature parks in Świętokrzyskie mountains: Jeleniowska Landscape Park Cisów-Orłowiny Landscape Park Suchedniów-Oblęgorek Landscape Park Sieradowice Landscape Park Chęciny-Kielce Landscape Park See also Bartek the most famous tree in Poland Caledonian orogenesis Holy Cross Province References External links Mountain ranges of Poland Landforms of Świętokrzyskie Voivodeship