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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Geography of Chicago and surrounding counties.

The city of Chicago is located in northern Illinois, United States, at the south western tip of Lake Michigan. It sits on the Saint Lawrence Seaway continental divide at the site of the Chicago Portage, an ancient trade route connecting the Mississippi River and the Great Lakes watersheds.

Geography[edit]

Chicago's present natural geography is a result of the large glaciers of the Ice Age, namely the Wisconsinan Glaciation that carved out the modern basin of Lake Michigan (which formed from the glacier's meltwater). The city of Chicago itself sits on the Chicago Plain, a flat plain that was once the bottom of ancestral Lake Chicago. This plain has very little topographical relief, in fact, topographical relief is so unusual in the plain that what would be unnoticed hills and ridges in other locales have been given names. The highest natural point within the city limits is in the Beverly neighborhood at 41°42′12.5″N 87°40′37″W / 41.703472°N 87.67694°W / 41.703472; -87.67694 at 672 ft (205 m).[1] In pioneer days, this hill was called Blue Island, so named because at a distance it looked like an island set in a trackless prairie sea. In fact it, and the nearby Stony Island, were both islands in Lake Chicago, as it receded. On the North side, the diagonals Clark Street and Ridge Boulevard run along ridges that were once sandbars in the Lake.

One special feature of the Chicago area was the now-vanished Mud Lake in the Des Plaines River watershed. During heavy periods of rain or when the Des Plaines overflowed its banks due to downstream ice dams in the early spring, the river would flow through Mud Lake to the South Branch of the Chicago River, forming a favorite portage for early traders and creating the path of the future I&M and Chicago Sanitary and Ship Canals. When the city we know today was initially founded in the 1830s, the land was swampy and most of the early building began on low dunes around the Chicago River's mouth. Indeed, Chicago's low lying geography, which ultimately became crucial to its boom town development (as the site of the Chicago Portage and canal), could not initially attract substantial early settlement because the tall grass prairie around its lake and river systems was underlain by hard packed glacial clay, making much of the area forbidding wetlands.[2] Thus, the paradox of Chicago's development as a city in the 19th century became taking advantage of this geography, but also overcoming its limitations.

North of the city of Chicago, there are steep bluffs and ravines that run along Lake Michigan. In contrast, south of the city of Chicago into Northwest Indiana it is without bluffs, but instead has sand dunes. The greatest example of these can be seen at Indiana Dunes National Lakeshore, where some dunes reach up to almost 200 feet. Farther inland, a series of moraines surrounds the Chicago Plain. This surrounding area is hilly and higher than the Chicago Plain. Past the moraines, the land flattens out again, but is interspersed with a few deep river valleys such as the Illinois River, Fox River, Des Plaines River, and Kankakee River. Here you may find rock cliffs and rock ravines, which are absent from the interior Chicago area (the ravines of the north shore and south suburbs are soil ravines without any rock).

City limits of Chicago.

Also, a very large limestone quarry (Thornton Quarry) exists just south of the city of Chicago in the suburb of Thornton. It was once a coral reef when the Midwest was covered by a warm inland sea (hundreds of millions of years before the glaciation of the Chicago area). The rest of the Chicago area does not have bedrock this close to the surface.

Climate[edit]

The city lies within the humid continental climate zone, and experiences four distinct seasons. Summers are warm and humid with a July average of 75.5 °F (24.2 °C). Winters are cold, snowy and windy with temperatures below freezing. Spring and fall are mild with moderate humidity. According to the National Weather Service, Chicago’s highest official temperature reading of 107 °F (42 °C) was recorded on June 1, 1934. The lowest temperature of −27 °F (−33 °C) was recorded on January 20, 1985. Along with long, hot dry spells in the summer, Chicago can suffer extreme winter cold spells. In the entire month of January 1977, the temperature did not rise above 31 °F (−0.6 °C). The average temperature that month was around 10 °F (−12 °C).

Chicago’s yearly precipitation averages about 34 inches (860 millimeters). Summer is typically the rainiest season, with short-lived rainfall and thunderstorms more common than prolonged rainy periods.[3] Winter precipitation tends to be more snow than rain. Chicago's snowiest winter on record was that of 1978–79, with 89.7 inches (227.8 cm) of snow in total. The winter of 2007-08, with more than 61 inches (155 cm) of snow, was the snowiest in nearly three decades, and the winter of 2008/2009 produced just over 50 inches (127 cm). This marked the first time in three decades that back-to-back winters produced 50 inches or more of snow. Average winter snowfall is normally, depending on the reporting location, 43.1 inches (109.5 cm). The highest one-day snowfall total in Chicago history was 18.6 inches (47.2 cm) on January 2, 1999.[4] Chicago’s highest one-day rainfall total was 6.63 inches (168.4 mm) on September 13, 2008.[5] The previous record of 6.49 inches (164.8 mm) had been set on August 14, 1987. The record for yearly rainfall is 50.86 inches (1,292 mm) set in 2008; 1983 was the wettest year before with 49.35 inches (1,253 mm).[5]


Statistics[edit]

According to the United States Census Bureau, the City of Chicago has a total area of 606.1 km² (234.0 mi²). 588.3 km² (227.1 mi²) of it is land and 17.8 square kilometres (6.9 sq mi) of it is water. The total area is 2.94% water. The city has been built on relatively flat land, the average height of land is 579 feet (176 m) above sea level. The centroid (geographical center) of the city is at 41°50′26″N 87°40′46″W / 41.840675°N 87.679365°W / 41.840675; -87.679365,[14] southeast of 28th and Leavitt Streets in an industrial area near the Chicago Sanitary and Ship Canal. (Before annexations in the 1950s, notably for O'Hare International Airport, references placed the geographical center near 37th and Honore Streets.) Chicago, along with New York City and Los Angeles, California are the three most populous cities of the U.S., yet Chicago is only half the other two cities' individual land areas. Chicago's nickname, "The Windy City," actually acquired from a political op-ed piece, fits the city well as its location on Lake Michigan moderates the climate and often provides a breeze.

The Chicago Metropolitan Statistical Area (MSA) consists of Cook county and five surrounding Illinois counties as well as the Chicago–Gary–Kenosha Combined Statistical Area (CSA) which is made up of nine counties, two of them in northwestern Indiana and one in southeastern Wisconsin.

The Chicago skyline.

Cityscape[edit]

After building the first ever skyscraper (Home Insurance Building), Chicago has been at the forefront of skyscraper building ever since. Today Chicago can boast to having 4 of the 10 tallest buildings in the United States and 9 of the 100 in the world.

By modern standards, Chicago has little reason to build up: being located in the Midwest, it has plenty of room to sprawl outwards on almost Euclideanesque flat ground. There is the Chicago River, which may bring some argument as to geographic restriction, but the impact of which was strongly lessened by the strict adherence to the Chicago grid across the river.

Today, Chicago is going through a massive skyscraper building boom, with projects like 55 East Erie (the tallest residential building in the U.S. outside New York City) and Trump International Hotel (completed in August 2008, it is the second tallest in Chicago and the tallest building built in the U.S. for nearly three decades) breaking ground frequently. This can be attributed to the precedent that Chicago has always had a history of frantic skyscraper building, mostly beginning after the Great Chicago Fire when the price of land in the city increased. This caused architects to start building upward. Since this time developers simply follow the pattern set before them.

See also[edit]

Notes[edit]

  1. ^ a b Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1981 to 2010.
  2. ^ Official records for Chicago were kept at various locations in downtown from January 1871 to 31 December 1925, University of Chicago from 1 January 1926 to 30 June 1942, Midway Airport from 1 July 1942 to 16 January 1980, and at O'Hare Airport since 17 January 1980.[10][11]

References[edit]

  1. ^ "Chicago Facts" (PDF). Northeastern Illinois University. p. 46. Archived from the original (PDF) on 10 November 2013. Retrieved 28 August 2013. 
  2. ^ Donald L. Miller, City of the Century, p. 67 (Simon & Schuster, New York, 1996)
  3. ^ Chicago Seasonal Temperature and Precipitation Rankings (11/25/2005). National Weather Service Weather Forecast Office - Chicago, IL.
  4. ^ "January Weather Trivia". National Weather Service. Retrieved 2012-03-21. 
  5. ^ a b [1]. National Weather Service Weather Forecast Office - Chicago, IL.
  6. ^ "Station Name: IL CHICAGO MIDWAY AP". National Climatic Data Center. Retrieved 2013-03-12. 
  7. ^ a b "NowData - NOAA Online Weather Data". NWS Romeoville, IL. Retrieved 2016-04-18. 
  8. ^ "Top 20 Weather Events of the Century for Chicago and Northeast Illinois 1900–1999". NWS Romeoville, IL. Retrieved 2014-06-16. 
  9. ^ "CHICAGO MIDWAY AP 3 SW, ILLINOIS". Western Regional Climate Center. Retrieved 2014-06-12. 
  10. ^ History of the Chicago and Rockford weather observation sites
  11. ^ ThreadEx
  12. ^ "Station Name: IL CHICAGO OHARE INTL AP". National Oceanic and Atmospheric Administration. Retrieved 2013-03-18. 
  13. ^ "Chicago/O'Hare, IL Climate Normals 1961-1990". National Oceanic and Atmospheric Administration. Retrieved May 14, 2013. 
  14. ^ "Geographic Midpoint Calculator". GeoMidpoint.com. Retrieved 25 October 2013. 

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