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The river Chalaronne forms part of the commune's western border.
Climate
Marlieux has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Marlieux is 12.2 °C (54.0 °F). The average annual rainfall is 909.1 mm (35.79 in) with October as the wettest month. The temperatures are highest on average in July, at around 21.3 °C (70.3 °F), and lowest in January, at around 3.4 °C (38.1 °F). The highest temperature ever recorded in Marlieux was 41.3 °C (106.3 °F) on 13 August 2003; the coldest temperature ever recorded was −23.0 °C (−9.4 °F) on 6 January 1971.
Climate data for Marlieux (1991–2020 averages, extremes 1964−present)
^"Répertoire national des élus: les maires" (in French). data.gouv.fr, Plateforme ouverte des données publiques françaises. 13 September 2022. Archived from the original on 28 June 2020. Retrieved 6 May 2024.