New York City

New York is the most populous city in the United States and the center of the New York metropolitan area, which is one of the most populous metropolitan areas in the world. New York City has a significant impact on global commerce, finance, media, culture, art, fashion, research, education, and entertainment. As host of the United Nations Headquarters, it is also an important center for international affairs. The city is often referred to as New York City or the City of New York to distinguish it from the state of New York, of which it is a part.

Located on a large natural harbor on the Atlantic coast of the Northeastern United States, the city consists of five boroughs: The Bronx, Brooklyn, Manhattan, Queens, and Staten Island. The city's 2009 estimated population approached 8.4 million, and with a land area of 305 square miles (790 km²), New York City is the most densely populated major city in the United States. The New York metropolitan area's population is the USA's largest, estimated at 19.1 million people over 6,720 square miles (17,400 km²). The Combined Statistical Area contained 22.2 million people as of 2009 Census estimates, also the largest in the United States.

New York was founded as a commercial trading post by the Dutch in 1624. The settlement was called New Amsterdam until 1664 when the colony came under English control. New York served as the capital of the United States from 1785 until 1790. It has been the country's largest city since 1790. As many as 800 languages are spoken in New York City, making it the most linguistically diverse city in the world.

Many districts and landmarks in the city have become well known to outsiders. The Statue of Liberty greeted millions of immigrants as they came to America in the late 19th and early 20th centuries. Times Square, iconified as "The Crossroads of the World", is the brightly illuminated hub of the Broadway theater district, one of the world's busiest pedestrian intersections, and a major center of the world's entertainment industry. Anchored by Wall Street, in Lower Manhattan, New York vies with London as the financial capital of the world and is home to the New York Stock Exchange, the world's largest stock exchange by market capitalization of its listed companies. The original Manhattan Chinatown attracts throngs of tourists to its bustling sidewalks and retail establishments. World-class schools and universities such as Columbia University and New York University also reside in New York City.

New York City is located in the Northeastern United States, in southeastern New York State, approximately halfway between Washington, D.C. and Boston. The location at the mouth of the Hudson River, which feeds into a naturally sheltered harbor and then into the Atlantic Ocean, has helped the city grow in significance as a trading city. Much of New York is built on the three islands of Manhattan, Staten Island, and Long Island, making land scarce and encouraging a high population density.

The Hudson River flows through the Hudson Valley into New York Bay. Between New York City and Troy, New York, the river is an estuary. The Hudson separates the city from New Jersey. The East River – a tidal strait – flows from Long Island Sound and separates the Bronx and Manhattan from Long Island. The Harlem River, another tidal strait between the East and Hudson Rivers, separates Manhattan from the Bronx. The Bronx River, which flows through the Bronx and Westchester County, is the only entirely fresh water river in the city.

The city's land has been altered substantially by human intervention, with considerable land reclamation along the waterfronts since Dutch colonial times. Reclamation is most prominent in Lower Manhattan, with developments such as Battery Park City in the 1970s and 1980s. Some of the natural variations in topography have been evened out, especially in Manhattan.

The city's land area is estimated at 304.8 square miles (789 km²). Its total area is 468.9 square miles (1,214 km²). 164.1 square miles (425 km²) of this are water and 304.8 square miles (789 km²) is land. The highest point in the city is Todt Hill on Staten Island, which, at 409.8 feet (124.9 m) above sea level, is the highest point on the Eastern Seaboard south of Maine. The summit of the ridge is mostly covered in woodlands as part of the Staten Island Greenbelt.

Under the Köppen climate classification New York City has a humid subtropical climate (Cfa), and using the 0 °C threshold it is the northernmost major city on the continent with such categorization.

The area averages 234 days with at least some sunshine annually, and averages 58% of possible sunshine annually. Winters are cold and damp, and prevailing wind patterns that blow offshore minimize the moderating effects of the Atlantic Ocean. Yet the Atlantic and the partial shielding of the Appalachians keep the city warmer in the winter than inland North American cities located at similar or lesser latitudes such as Pittsburgh, Cincinnati, and Indianapolis. The average temperature in January, the area's coldest month, is 32.1 °F (0.1 °C). However temperatures in winter could for a few days be as low as 10 °F (−12 °C) and as high as 50 °F (10 °C). Spring and autumn are unpredictable, and can range from chilly to warm, although they are usually pleasantly mild with low humidity. Summers are typically hot and humid with a July average of 76.5 °F (24.7 °C). Nighttime conditions are often exacerbated by the urban heat island phenomenon, and temperatures exceed 90 °F (32 °C) on average of 18 days each summer and can exceed 104 °F (40 °C) every 4–6 years.

The city receives 49.7 inches (1,260 mm) of precipitation annually, which is fairly spread throughout the year. Average winter snowfall for the past century has been 28 inches (71 cm), but this usually varies considerably from year to year, and snow cover usually melts within a few days. Hurricanes and tropical storms are rare in the New York area, but are not unheard of and always have the potential to strike the area.