Örebro ( , ) is the sixth-largest city in Sweden, the seat of Örebro Municipality, and capital of the Örebro County. It is situated by the Närke Plain, near the lake Hjälmaren, a few kilometers inland along the small river Svartån, and has a population of approximately 126,000 in the city proper. It is one of the largest inland hubs of the country, and a major logistic and commercial operating site. Örebro is home to Örebro University, a major university hospital, a medieval castle, the water park Gustavsvik as well as several large shopping malls and the Oset-Rynningeviken nature reserve at the lakefront. Örebro is served by Örebro Airport 10 km (6 mi) southwest of the city, and by Örebro Central Station, serviced by the Mälaren Line and Western Main Line. Etymology The name Örebro refers to a bridge () crossing the river Svartån where the city is located. The prefix is derived from 'gravel (bank)'. History Örebro received its Royal Charter and city privileges not later than 1404. The location became a natural seat of commerce in the Scandinavian Middle Ages and is mentioned in print in the 13th century. Old buildings from the early days include the foundations of the city church, a building which has undergone several modifications. The natural center of the city is otherwise Örebro Castle, situated on an islet in the Svartån, and dividing the town into a northern and a southern part. This castle was constructed during the stewardship of Birger Jarl during the late 13th century and then modified and enlarged during the reign of King Gustav Vasa in the 1560s. The Örebro Synod was held here in 1529. Notable events in Örebro's history include the national diet meeting at Örebro in 1810, where Jean-Baptiste Bernadotte was elected crown prince of Sweden. Although a trade town, Örebro remained small until the second half of the 19th century, when it grew rapidly as a center of the national shoe-manufacturing industry. Climate Örebro, like the rest of the area close to Mälardalen, has a humid continental climate (Köppen Dfb) that is made milder by the proximity to water and the Gulf Stream which makes it interchangeable with oceanic climates. Summer temperatures occasionally exceed albeit not yearly, and temperatures above are rare in winter, although frost-free nights sometimes occur. July high temperatures range from to depending on weather patterns, with a 2002–2014 mean high of