Saint-Martin-du-Mont has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Saint-Martin-du-Mont is 9.6 °C (49.3 °F). The average annual rainfall is 962.7 mm (37.90 in) with November as the wettest month. The temperatures are highest on average in July, at around 18.4 °C (65.1 °F), and lowest in January, at around 1.6 °C (34.9 °F). The highest temperature ever recorded in Saint-Martin-du-Mont was 37.4 °C (99.3 °F) on 12 August 2003; the coldest temperature ever recorded was −15.7 °C (3.7 °F) on 20 December 2009.
Climate data for Saint-Martin-du-Mont (1981–2010 averages, extremes 1992−present)