Rostrenen

Commune in Brittany, France

Rostrenen Rostrenenn
Commune
The church of Notre-Dame du Roncier in Rostrenen
Flag Coat of arms
Location of Rostrenen
(2020–2026)		Guillaume Robic^[1]
Area ¹	32.17 km² (12.42 sq mi)
Population (2021)^[2]	3,207
• Density	100/km² (260/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	22266 /22110
Elevation	152–262 m (499–860 ft)
¹ French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.

Rostrenen (French pronunciation: [ʁɔstʁənɛ̃]; Breton: Rostrenenn) is a commune in the Côtes-d'Armor department and Brittany region of northwestern France.

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 a oceanic climate (Köppen climate classification Cfb). The average annual temperature in Rostrenen is 10.7 °C (51.3 °F). The average annual rainfall is 1,145.7 mm (45.11 in) with January as the wettest month. The temperatures are highest on average in August, at around 17.0 °C (62.6 °F), and lowest in January, at around 5.2 °C (41.4 °F). The highest temperature ever recorded in Rostrenen was 37.9 °C (100.2 °F) on 9 August 2003; the coldest temperature ever recorded was −13.9 °C (7.0 °F) on 20 January 1963.

Climate data for Rostrenen (1981–2010 averages, extremes 1954−present)
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °C (°F)	15.8 (60.4)	21.3 (70.3)	24.1 (75.4)	27.2 (81.0)	28.5 (83.3)	33.9 (93.0)	35.1 (95.2)	37.9 (100.2)	32.3 (90.1)	27.8 (82.0)	19.2 (66.6)	16.0 (60.8)	37.9 (100.2)
Mean daily maximum °C (°F)	7.6 (45.7)	8.1 (46.6)	10.8 (51.4)	12.9 (55.2)	16.2 (61.2)	19.4 (66.9)	21.4 (70.5)	21.5 (70.7)	19.0 (66.2)	14.9 (58.8)	10.8 (51.4)	8.1 (46.6)	14.3 (57.7)
Daily mean °C (°F)	5.2 (41.4)	5.3 (41.5)	7.4 (45.3)	9.0 (48.2)	12.2 (54.0)	14.9 (58.8)	17.0 (62.6)	17.0 (62.6)	15.0 (59.0)	11.7 (53.1)	8.1 (46.6)	5.7 (42.3)	10.7 (51.3)
Mean daily minimum °C (°F)	2.7 (36.9)	2.5 (36.5)	4.0 (39.2)	5.1 (41.2)	8.1 (46.6)	10.5 (50.9)	12.5 (54.5)	12.5 (54.5)	10.9 (51.6)	8.5 (47.3)	5.3 (41.5)	3.3 (37.9)	7.2 (45.0)
Record low °C (°F)	−13.9 (7.0)	−12.0 (10.4)	−7.9 (17.8)	−3.2 (26.2)	−0.2 (31.6)	2.9 (37.2)	5.9 (42.6)	5.6 (42.1)	3.0 (37.4)	−1.9 (28.6)	−5.2 (22.6)	−9.6 (14.7)	−13.9 (7.0)
Average precipitation mm (inches)	137.3 (5.41)	104.9 (4.13)	92.3 (3.63)	82.2 (3.24)	85.3 (3.36)	55.0 (2.17)	63.1 (2.48)	58.5 (2.30)	83.3 (3.28)	126.2 (4.97)	120.6 (4.75)	137.0 (5.39)	1,145.7 (45.11)
Average precipitation days (≥ 1.0 mm)	16.6	13.7	13.8	12.6	11.6	8.8	9.6	9.5	10.6	15.1	15.5	16.2	153.6
Mean monthly sunshine hours	60.4	76.9	117.1	146.5	173.0	195.8	175.5	167.8	157.2	99.0	73.4	61.5	1,504.2
Source: Météo France^[3]

Population

In French the inhabitants of Rostrenen are known as Rostrenois.

Historical population
Year	Pop.	±% p.a.
1968	3,658	—
1975	3,875	+0.83%
1982	3,868	−0.03%
1990	3,664	−0.67%
1999	3,616	−0.15%
2007	3,392	−0.80%
2012	3,256	−0.82%
2017	3,060	−1.23%
Source: INSEE^[4]

Map

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.^[5]

References

^ "Répertoire national des élus: les maires" (in French). data.gouv.fr, Plateforme ouverte des données publiques françaises. 13 September 2022.
^ "Populations légales 2021". The National Institute of Statistics and Economic Studies. 28 December 2023.
^ "Climate of Rostrenen 1981-2010" (PDF) (in French). Météo-France. Retrieved 19 June 2022.
^ Population en historique depuis 1968, INSEE
^ (in French) Ofis ar Brezhoneg: Enseignement bilingue