PlouguenastPlouguenast is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Plouguenast-Langast.WWW Official SiteClimatePlouguenast has an oceanic climate. The average annual temperature in Plouguenast is. The average annual rainfall is with January as the wettest month. The temperatures are highest on average in August, at around, and lowest in January, at around. The highest temperature ever recorded in Plouguenast was on 9 August 2003; the coldest temperature ever recorded was on 2 January 1997.PopulationInhabitants of Plouguenast are called plouguenastais in French.