Budapest of Buda hills are environmentally protected. The city's importance in terms of traffic is very central, because all major European roads and European railway lines lead to Budapest. The Danube was and is still an important water-way and this region in the centre of the Carpathian Basin lies at the cross-roads of trade routes. Budapest is one of only two capital cities in the world which has thermal springs (the other being Reykjavík in Iceland). Some 125 springs produce of thermal water a day, with temperatures ranging up to 58 Celsius. Some of these waters have medicinal effects due to
Budapest night. Budapest's long summer – lasting from May until mid-September – is warm or very warm. Sudden heavy showers also occur, particularly in May and June. The autumn in Budapest (mid-September until late October) is characterised by little rain and long sunny days with moderate temperatures. Temperatures often turn abruptly colder in late October. Spring and Autumn are generally mild. Mean annual precipitation in Budapest is around . On average, there are 84 days with precipitation and 1988 hours of sunshine (of a possible 4383) each year. The city lies on the boundary between Zone 6 and Zone 7 in