Labarthe-RivièreLabarthe-Rivière is a commune in the Haute-Garonne department in southwestern France.WWW labarthe-riviere.frGeographyClimateLabarthe-Rivière has an oceanic climate. The average annual temperature in Labarthe-Rivière is. The average annual rainfall is with May 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 Labarthe-Rivière was on 30 July 1983; the coldest temperature ever recorded was on 9 January 1985.