CastelvieilhCastelvieilh is a commune in the Hautes-Pyrénées department in south-western France.GeographyClimateCastelvieilh has an oceanic climate closely bordering on a humid subtropical climate. The average annual temperature in Castelvieilh 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 Castelvieilh was on 4 August 2003; the coldest temperature ever recorded was on 8 February 2012.