Saint-Julien-sur-ReyssouzeSaint-Julien-sur-Reyssouzè is a commune in the Ain department in eastern France.GeographyClimateSaint-Julien-sur-Reyssouze has an oceanic climate. The average annual temperature in Saint-Julien-sur-Reyssouze 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 Saint-Julien-sur-Reyssouze was on 13 August 2003; the coldest temperature ever recorded was on 20 December 2009.