Pittsburgh is a city in western Pennsylvania and also seat of Allegheny County. Pittsburgh was the nation's major industrial city of the 19th century and was prominent for its steel production. Starting in the 1970s it underwent severe deindustrialization as its massive steel complexes started to close. Currently Pittsburgh is a post-industrial city, with an economy based on services, especially medical, financial, corporate, and educational, rather than steel.
Pittsburgh sits astride the Monongahela and Allegheny rivers where they unite to form the Ohio River. Most of the city lies on hills surrounding this historic river junction, although Pittsburgh's downtown core is clustered over a wedge of level ground framed by the rivers and dubbed the "Golden Triangle." Winters in Pittsburgh can be cold and snowy and summers hot and humid, but seasons are usually moderate. The average high temperature in January is 1° C (34° F) and the average low is -7° C (19° F); the average high in July is 28° C (83° F) and the average low is 17° C (62° F). The city yearly gets about 940 mm (about 37 in) of precipitation, with accumulations evenly distributed all year round.
The city created around a frontier fort used by both the British as well as the French within the 18th century. In 1794 Pittsburgh was incorporated being a borough and in 1816 the Commonwealth of Pennsylvania granted it city rank. It is named after William Pitt, prime minister of Great Britain in the late eighteenth century.
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