{{Use dmy dates|date=August 2023}} {{Infobox French commune |name = Rostrenen |native name = Rostrenenn |commune status = [[Communes of France|Commune]] |image = Iliz Rostren.JPG |caption = The church of Notre-Dame du Roncier in Rostrenen |image coat of arms = Blason Rostrenen.svg |image flag = Drapeau de Rostrenen.svg |coordinates = {{coord|48.2372|-3.3155|format=dms|display=inline,title}} |INSEE = 22266 |postal code = 22110 |arrondissement = Guingamp |canton = Rostrenen |mayor = Guillaume Robic<ref>{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|publisher=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=13 September 2022|language=fr}}</ref> |term = 2020–2026 |intercommunality = Kreiz-Breizh |elevation min m = 152 |elevation max m = 262 |area km2 = 32.17 |population = {{France metadata Wikidata|population_total}} |population date = {{France metadata Wikidata|population_as_of}} |population footnotes = {{France metadata Wikidata|population_footnotes}} }}
'''Rostrenen''' ({{IPA|fr|ʁɔstʁənɛ̃}}; {{Langx|br|Rostrenenn}}) is a [[Communes of France|commune]] in the French [[Departments of France|department]] of [[Côtes-d'Armor]], in [[Brittany (administrative region)|Brittany]].
The commune is listed as a [[Village étape]].<ref>{{Cite web|url=https://village-etape.fr/village-etape/rostrenen/|title=Rostrenen | Village Étape}}</ref>
==Geography==
===Neighbouring communes===
Rostrenen is border by [[Mellionnec]] to the south, [[Plouguernevel]] to the east, [[Kergrist-Moëlou]] to the north, and [[Glomel]] to the west.
===Climate=== Rostrenen has an [[oceanic climate]] ([[Köppen climate classification]] ''Cfb''). The average annual temperature in Rostrenen is {{cvt|11.1|C}}. The average annual rainfall is {{cvt|1146.6|mm}} with December as the wettest month. The temperatures are highest on average in August, at around {{cvt|17.3|C}}, and lowest in January, at around {{cvt|5.6|C}}. The highest temperature ever recorded in Rostrenen was {{cvt|39.3|C}} on 18 July 2022; the coldest temperature ever recorded was {{cvt|-13.9|C}} on 20 January 1963. {{Weather box |location = Rostrenen (1991–2020 averages, extremes 1954−present) |width = auto |collapsed = true |metric first = yes |single line = yes |Jan record high C = 15.8 |Feb record high C = 21.3 |Mar record high C = 24.1 |Apr record high C = 27.2 |May record high C = 28.5 |Jun record high C = 35.7 |Jul record high C = 39.3 |Aug record high C = 37.9 |Sep record high C = 32.3 |Oct record high C = 28.8 |Nov record high C = 19.2 |Dec record high C = 16.0 |year record high C = 39.3 |Jan high C = 8.0 |Feb high C = 8.8 |Mar high C = 11.3 |Apr high C = 13.9 |May high C = 16.9 |Jun high C = 19.8 |Jul high C = 21.7 |Aug high C = 21.9 |Sep high C = 19.4 |Oct high C = 15.2 |Nov high C = 11.2 |Dec high C = 8.6 |year high C = 14.7 |Jan mean C = 5.6 |Feb mean C = 5.8 |Mar mean C = 7.8 |Apr mean C = 9.7 |May mean C = 12.6 |Jun mean C = 15.3 |Jul mean C = 17.1 |Aug mean C = 17.3 |Sep mean C = 15.2 |Oct mean C = 12.0 |Nov mean C = 8.5 |Dec mean C = 6.1 |year mean C = 11.1 |Jan low C = 3.1 |Feb low C = 2.9 |Mar low C = 4.2 |Apr low C = 5.5 |May low C = 8.2 |Jun low C = 10.7 |Jul low C = 12.5 |Aug low C = 12.7 |Sep low C = 10.9 |Oct low C = 8.7 |Nov low C = 5.8 |Dec low C = 3.7 |year low C = 7.4 |Jan record low C = -13.9 |Feb record low C = -12.0 |Mar record low C = -7.9 |Apr record low C = -3.2 |May record low C = -0.2 |Jun record low C = 2.9 |Jul record low C = 5.9 |Aug record low C = 5.6 |Sep record low C = 3.0 |Oct record low C = -1.9 |Nov record low C = -5.2 |Dec record low C = -9.6 |year record low C = -13.9 |precipitation colour = green |Jan precipitation mm = 135.4 |Feb precipitation mm = 109.4 |Mar precipitation mm = 82.8 |Apr precipitation mm = 81.2 |May precipitation mm = 76.4 |Jun precipitation mm = 57.0 |Jul precipitation mm = 66.7 |Aug precipitation mm = 67.7 |Sep precipitation mm = 75.7 |Oct precipitation mm = 120.3 |Nov precipitation mm = 127.9 |Dec precipitation mm = 146.1 |year precipitation mm = 1146.6 |unit precipitation days = 1.0 mm |Jan precipitation days = 16.3 |Feb precipitation days = 14.2 |Mar precipitation days = 12.8 |Apr precipitation days = 12.2 |May precipitation days = 10.4 |Jun precipitation days = 9.0 |Jul precipitation days = 10.0 |Aug precipitation days = 10.1 |Sep precipitation days = 10.3 |Oct precipitation days = 14.9 |Nov precipitation days = 16.4 |Dec precipitation days = 17.4 |year precipitation days = 154.1 |source 1 = [[Meteociel]]<ref>{{cite web | url = https://www.meteociel.fr/obs/clim/normales_records.php?code=22266001 | title=Normals and records for Rostrenen (22) | language = fr | publisher = [[Météo-France]] | access-date = August 20, 2025}}</ref>}}
==Population==
In French the inhabitants of Rostrenen are known as ''Rostrenois''. {{Historical populations |source = INSEE<ref name=pophist>[https://www.insee.fr/fr/statistiques/8643952?geo=COM-22266#tableau-POPREF_G1 Population municipale entre 1968 et 2023], INSEE</ref> |percentages = pagr |align = none |1968 |3658 |1975 |3875 |1982 |3868 |1990 |3664 |1999 |3616 |2007 |3392 |2012 |3256 |2017 |3060 |2023 |3282 }}
==Map==
{{wide image|Rostrenen_opentopomap.png|300px|Topographic map}}
==Breton language== On 13 September 2004 the municipality launched a linguistic plan as part of the [[Ya d'ar brezhoneg]] (Yes to Breton) campaign. In 2008, 34.5% of primary children attended bilingual schools.<ref>{{in lang|fr}} ''Ofis ar Brezhoneg'': [http://www.ofis-bzh.org/fr/services/observatoire/travaux.php?travail_id=83 ''Enseignement bilingue'']</ref>
[[File:RB-Rostrenen.jpg|thumb|left|The former railway station (1898–1967)]] {{clear|left}}
==See also== *[[Communes of the Côtes-d'Armor department]]
==References== {{reflist}}
==External links== {{commons category}} *[http://www.rostrenen.com Official website] {{in lang|fr}} *{{Search Mérimée|22266}}
{{Côtes-d'Armor communes}}
{{authority control}}
[[Category:Communes of Côtes-d'Armor]]
{{Guingamp-geo-stub}}