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==Geography== The USGS Domestic GeoNames resource has two listings for Decatur: "City of Decatur", which is a Civil-class designation, and "Decatur", which is a Populated Place designation. The two listings have slightly different coordinate centroids; the "City of Decatur" centroid is located at {{Coord|39.8556417|-88.9337090}},<ref>{{Cite web|url=http://geonames.usgs.gov/apex/f?p=gnispq:3:::NO::P3_FID:2394481|title=City of Decatur|website=U.S. Board on Geographic Names: Domestic Names|access-date=October 11, 2019}}</ref> while the "Decatur" centroid is at {{Coord|39.8403147|-88.9548001}}.<ref>{{Cite web|url=http://geonames.usgs.gov/apex/f?p=gnispq:3:::NO::P3_FID:407044|title=Decatur|website=U.S. Board on Geographic Names: Domestic Names|access-date=October 11, 2019}}</ref> Decatur is 150 miles southwest of [[Chicago]], 40 miles east of [[Springfield, Illinois|Springfield]], the state capital, and 110 miles northeast of [[St. Louis]]. According to the 2010 census, consisted of {{convert|42.22|sqmi|sqkm|2}} of land and {{convert|4.69|sqmi|sqkm|2}} of water,<ref name="census-g001">{{cite web |url=http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/G001/1600000US1718823 |title=G001 – Geographic Identifiers – 2010 Census Summary File 1 |access-date=December 27, 2015 |publisher=[[United States Census Bureau]] |archive-url=https://archive.today/20200213045302/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/G001/1600000US1718823 |archive-date=February 13, 2020 |url-status=dead }}</ref> amounting to a total area of {{convert|46.91|sqmi|sqkm|2}}, consisting of 90% land and 10% water. Lakes include [[Lake Decatur]], an 11 km<sup>2</sup> reservoir formed in 1923 by the damming of the [[Sangamon River]]. The Decatur [[United States metropolitan area|Metropolitan Statistical Area]] (population 109,900) includes surrounding towns of [[Argenta, Illinois|Argenta]], [[Boody, Illinois|Boody]], [[Blue Mound, Illinois|Blue Mound]], [[Elwin, Illinois|Elwin]], [[Forsyth, Illinois|Forsyth]], [[Harristown, Illinois|Harristown]], [[Long Creek, Illinois|Long Creek]], [[Macon, Illinois|Macon]], [[Maroa, Illinois|Maroa]], [[Mount Zion, Illinois|Mount Zion]], [[Niantic, Illinois|Niantic]], [[Oakley, Illinois|Oakley]], [[Oreana, Illinois|Oreana]], and [[Warrensburg, Illinois|Warrensburg]]. ===Neighborhoods=== On July 19, 1999, the Department of Community Development prepared a map of the official neighborhoods of Decatur, used for planning and statistical purposes. Decatur has 71 official neighborhoods.<ref>{{Cite web|url = https://www.decaturil.gov/public-information/permits-and-forms/neighborhood_map/|title = Neighborhood Map|access-date = June 25, 2019|author = City of Decatur, IL|archive-date = August 5, 2020|archive-url = https://web.archive.org/web/20200805220023/https://www.decaturil.gov/public-information/permits-and-forms/neighborhood_map/|url-status = dead}}</ref> ===Climate=== Decatur has a [[humid continental climate]] ([[Köppen climate classification|Köppen]] ''Dfa''). {{Weather box |location = Decatur WTP, Illinois (1991–2020 normals, extremes 1893–present) |single line = Y | Jan record high F = 73 | Feb record high F = 76 | Mar record high F = 89 | Apr record high F = 94 | May record high F = 101 | Jun record high F = 105 | Jul record high F = 113 | Aug record high F = 106 | Sep record high F = 104 | Oct record high F = 96 | Nov record high F = 83 | Dec record high F = 72 | year record high F = 113 | Jan high F = 34.0 | Feb high F = 39.1 | Mar high F = 50.8 | Apr high F = 63.4 | May high F = 73.5 | Jun high F = 82.2 | Jul high F = 84.7 | Aug high F = 83.5 | Sep high F = 77.7 | Oct high F = 65.3 | Nov high F = 50.3 | Dec high F = 38.6 | year high F = 61.9 | Jan mean F = 26.9 | Feb mean F = 31.3 | Mar mean F = 41.8 | Apr mean F = 53.3 | May mean F = 63.7 | Jun mean F = 72.6 | Jul mean F = 75.6 | Aug mean F = 74.2 | Sep mean F = 67.3 | Oct mean F = 55.5 | Nov mean F = 42.3 | Dec mean F = 31.8 | year mean F = 53.0 | Jan low F = 19.7 | Feb low F = 23.5 | Mar low F = 32.8 | Apr low F = 43.3 | May low F = 53.8 | Jun low F = 63.1 | Jul low F = 66.5 | Aug low F = 64.9 | Sep low F = 57.0 | Oct low F = 45.7 | Nov low F = 34.3 | Dec low F = 25.0 | year low F = 44.1 | Jan record low F = −23 | Feb record low F = −25 | Mar record low F = −10 | Apr record low F = 15 | May record low F = 25 | Jun record low F = 32 | Jul record low F = 45 | Aug record low F = 35 | Sep record low F = 20 | Oct record low F = 12 | Nov record low F = -3 | Dec record low F = −22 | year record low F = -25 | precipitation color = green | Jan precipitation inch = 2.40 | Feb precipitation inch = 2.00 | Mar precipitation inch = 2.64 | Apr precipitation inch = 4.12 | May precipitation inch = 4.95 | Jun precipitation inch = 4.73 | Jul precipitation inch = 4.00 | Aug precipitation inch = 3.50 | Sep precipitation inch = 3.08 | Oct precipitation inch = 3.41 | Nov precipitation inch = 3.21 | Dec precipitation inch = 2.40 | year precipitation inch = 40.44 | Jan snow inch = 5.9 | Feb snow inch = 2.5 | Mar snow inch = 0.9 | Apr snow inch = 0.4 | May snow inch = 0.0 | Jun snow inch = 0.0 | Jul snow inch = 0.0 | Aug snow inch = 0.0 | Sep snow inch = 0.0 | Oct snow inch = 0.0 | Nov snow inch = 0.4 | Dec snow inch = 3.5 | year snow inch = 13.6 | unit precipitation days = 0.01 in | Jan precipitation days = 9.2 | Feb precipitation days = 8.3 | Mar precipitation days = 9.9 | Apr precipitation days = 11.4 | May precipitation days = 13.3 | Jun precipitation days = 10.5 | Jul precipitation days = 9.5 | Aug precipitation days = 7.4 | Sep precipitation days = 7.8 | Oct precipitation days = 9.6 | Nov precipitation days = 9.4 | Dec precipitation days = 9.2 | year precipitation days = 115.5 | unit snow days = 0.1 in | Jan snow days = 3.7 | Feb snow days = 2.3 | Mar snow days = 0.7 | Apr snow days = 0.2 | May snow days = 0.0 | Jun snow days = 0.0 | Jul snow days = 0.0 | Aug snow days = 0.0 | Sep snow days = 0.0 | Oct snow days = 0.0 | Nov snow days = 0.4 | Dec snow days = 2.3 | year snow days = 9.6 |source 1 = [[NOAA]]<ref name= nws> {{cite web | url = https://w2.weather.gov/climate/xmacis.php?wfo=ilx | title = NowData – NOAA Online Weather Data | publisher = National Oceanic and Atmospheric Administration | access-date = July 21, 2021}}</ref><ref name=NCEI> {{cite web | url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&startDate=0001-01-01&endDate=9996-12-31&stations=USC00112193&format=pdf | title = Station: Decatur, IL | work = U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020) | publisher = National Oceanic and Atmospheric Administration | access-date = July 21, 2021}}</ref> }}
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