{{Infobox Italian comune | name = Guidonia Montecelio | official_name = Comune di Guidonia Montecelio | native_name = | image_skyline = Panorama Guidonia Montecelio.jpg | imagesize = | image_alt = | image_caption = Panorama of Guidonia | image_shield = Guidonia Montecelio-Stemma.svg | shield_alt = | image_map = Map of comune of Guidonia Montecelio (province of Rome, region Lazio, Italy).svg | map_alt = | map_caption = Guidonia within the Metropolitan City of Rome Capital | pushpin_label_position = | pushpin_map_alt = | coordinates = {{coord|42|00|N|12|43|E|display=inline}} | coordinates_footnotes = | region = Lazio | metropolitan_city = Rome (RM) | frazioni = Albuccione, Bivio di Guidonia, Colle Fiorito, Colleverde, La Botte, Marco Simone, Montecelio, Pichini, Setteville, Setteville Nord, Villalba, Villanova | mayor_party = | mayor = Mauro Lombardo | area_footnotes = | area_total_km2 = 79.47 | population_footnotes = <ref>{{cite web|title=Demography in Figures|publisher=Istituto nazionale di statistica (ISTAT)|url=http://demo.istat.it/index_e.html|access-date=2010-02-12|archive-date=2017-06-22|archive-url=https://web.archive.org/web/20170622080908/http://www.demo.istat.it/index_e.html|url-status=dead}} for August 2009</ref> | population_total = 86814 | population_as_of = 31 August 2021 | pop_density_footnotes = | population_demonym = Guidoniani | elevation_footnotes = | elevation_m = 105 | twin1 = | twin1_country = | saint = Maria Beata Vergine di Loreto | day = 10 December | postal_code = 00010, 00011, 00012, 00014 | area_code = 0774 | website = {{official website|http://www.guidonia.org}} | footnotes = }}
'''Guidonia Montecelio''' ({{IPA|it|ɡwiˈdɔːnja ˌmonteˈtʃɛːljo}}), commonly known as '''Guidonia''', is a town and ''comune'' in the Metropolitan City of Rome Capital, Lazio, central Italy.
==Geography== The municipality of Guidonia Montecelio, formed by the main towns of Guidonia and Montecelio, lies to the north-east of Rome, some kilometres from the Grande Raccordo Anulare - a ring-shaped motorway which forms a circle around the capital. The terrain of Guidonia Montecelio is mainly flat, and the community lies in between the Via Nomentana and the Via Tiburtina.
It borders with Fonte Nuova, Marcellina, Palombara Sabina, Rome, San Polo dei Cavalieri, Sant'Angelo Romano and Tivoli. The hamlets (''frazioni'') are Albuccione, Bivio di Guidonia, Colle Fiorito, Colleverde, La Botte, Marco Simone, Montecelio, Pichini, Setteville, Setteville Nord, Villalba and Villanova.
==History== Montecelio was founded in 998 as a fortified ''castrum'' (''Castrum Monticellorum'').
In 1915 the ''Regio Esercito'' (Italian Royal Army) built a major military airport in the area for its ''Corpo Aeronautico Militare'' (Military Aviation Corps), the predecessor of the Italian Royal Air Force founded in 1923.
Guidonia was erected as a ''comune'' in 1937 by Benito Mussolini, its name chosen to honour the ''Regia Aeronautica'' general Alessandro Guidoni (1880–1928), who had died on 27 April 1928 while testing a new parachute at the air force facilities.
== Demographics == {{Historical populations|1861|-|1871|2799|1881|3208|1901|4094|1911|4440|1921|4943|1931|5696|1936|6597|1951|12811|1961|22205|1971|32399|1981|49328|1991|55544|2001|67516|2011|81447|2021|88642|footnote=Source: ISTAT|cols=2|align=none}}
==Economy== [[File:Cave di travertino - Guidonia.jpg|thumb|left|300px|Travertine quarries in Guidonia.]] Today the town is part of the Rome metropolitan area, with a massive presence of industry (mainly travertine caves and cement industry) and the service sector. The number of residents commuting to Rome is high, with transport in a critical situation.
Guidonia is also home to Marco Simone Golf and Country Club, which was announced as the host of the 2022 Ryder Cup in June 2015, but with the COVID-19 pandemic postponing the 2020 Ryder Cup to 2021, subsequent matches were pushed back a year with Marco Simone then hosted the event in 2023.
==Climate== {{Weather box|width=auto |location = Guidonia (Guidonia Air Base), 1991–2020 |metric first = Yes |single line = Yes |collapsed = yes |Jan high C = 13.2 |Feb high C = 14.3 |Mar high C = 17.3 |Apr high C = 20.5 |May high C = 25.0 |Jun high C = 29.8 |Jul high C = 33.1 |Aug high C = 33.5 |Sep high C = 28.1 |Oct high C = 23.3 |Nov high C = 17.9 |Dec high C = 14.0 |year high C = 22.5 |Jan mean C = 7.8 |Feb mean C = 8.5 |Mar mean C = 11.2 |Apr mean C = 14.1 |May mean C = 18.4 |Jun mean C = 22.7 |Jul mean C = 25.5 |Aug mean C = 26.0 |Sep mean C = 21.5 |Oct mean C = 17.3 |Nov mean C = 12.6 |Dec mean C = 8.8 |year mean C = 16.2 |Jan low C = 2.4 |Feb low C = 2.6 |Mar low C = 5.1 |Apr low C = 7.7 |May low C = 11.8 |Jun low C = 15.6 |Jul low C = 18.0 |Aug low C = 18.4 |Sep low C = 14.9 |Oct low C = 11.3 |Nov low C = 7.4 |Dec low C = 3.5 |year low C = 9.9 |precipitation colour = green |Jan precipitation mm = 64.1 |Feb precipitation mm = 107.3 |Mar precipitation mm = 70.6 |Apr precipitation mm = 83.7 |May precipitation mm = 82.8 |Jun precipitation mm = 53.1 |Jul precipitation mm = 39.2 |Aug precipitation mm = 33.2 |Sep precipitation mm = 119.6 |Oct precipitation mm = 129.2 |Nov precipitation mm = 127.4 |Dec precipitation mm = 94.6 |year precipitation mm = 1004.9 |unit precipitation days = 1 mm |Jan precipitation days = 7.4 |Feb precipitation days = 7.8 |Mar precipitation days = 7.3 |Apr precipitation days = 8.3 |May precipitation days = 7.9 |Jun precipitation days = 4.8 |Jul precipitation days = 3.2 |Aug precipitation days = 3.1 |Sep precipitation days = 6.6 |Oct precipitation days = 7.5 |Nov precipitation days = 10.2 |Dec precipitation days = 8.8 |year precipitation days = 82.9 |Jan humidity = 73.7 |Feb humidity = 70.2 |Mar humidity = 69.0 |Apr humidity = 69.3 |May humidity = 68.0 |Jun humidity = 65.6 |Jul humidity = 63.3 |Aug humidity = 63.9 |Sep humidity = 67.6 |Oct humidity = 71.9 |Nov humidity = 75.4 |Dec humidity = 74.6 |year humidity = 69.4 |source 1 = NOAA<ref name=WMOCLINO>{{cite web | archive-url = https://web.archive.org/web/20230827053958/https://www.nodc.noaa.gov/archive/arc0216/0253808/1.1/data/0-data/Region-6-WMO-Normals-9120/Italy/CSV/Guidonia_16234.csv | archive-date = 27 August 2023 | url = https://www.nodc.noaa.gov/archive/arc0216/0253808/1.1/data/0-data/Region-6-WMO-Normals-9120/Italy/CSV/Guidonia_16234.csv | title = Guidonia Climate Normals 1991–2020 | work = World Meteorological Organization Climatological Standard Normals (1991–2020) | publisher = National Oceanic and Atmospheric Administration | access-date = 27 August 2023}}</ref> }}
==People== *David Di Michele - Football player
==International relations== {{See also|List of twin towns and sister cities in Italy}}
Guidonia Montecelio is twinned with: *{{flagicon|JPN}} Kawasaki, Japan *{{flagicon|USA}} Cape Canaveral, United States. *{{flagicon|RUS}} Kashira, Russia
==References== {{reflist}}
==External links== {{commons category-inline|Guidonia Montecelio}} *[https://web.archive.org/web/20070928134844/http://www.viviguidonia.it/Storia/tabid/59/Default.aspx Local portal] *[https://web.archive.org/web/20081031125823/http://www.guidonia.net/ News & Info from Guidonia Montecelio] *[http://www.tibursuperbum.it/ita/escursioni/guidoniamontecelio/index.htm Guidonia Montecelio]
{{Province of Rome}}
{{Authority control}}
Category:Cities and towns in Lazio Category:Italian fascist architecture