ChantonnayChantonnay is a commune in the Vendée department in the Pays de la Loire region in western France.WWW Official SiteGeographyThe river Lay flows southwestward through the commune and forms part of its eastern and southern borders.ClimateChantonnay has an oceanic climate. The average annual temperature in Chantonnay is. The average annual rainfall is with November as the wettest month. The temperatures are highest on average in July, at around, and lowest in January, at around. The highest temperature ever recorded in Chantonnay was on 27 June 2019; the coldest temperature ever recorded was on 15 February 1956.