Lanleff has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Lanleff is 11.6 °C (52.9 °F). The average annual rainfall is 839.3 mm (33.04 in) with December as the wettest month. The temperatures are highest on average in July, at around 17.6 °C (63.7 °F), and lowest in January, at around 6.7 °C (44.1 °F). The highest temperature ever recorded in Lanleff was 37.5 °C (99.5 °F) on 19 July 2016; the coldest temperature ever recorded was −8.0 °C (17.6 °F) on 11 December 1991.
Climate data for Lanleff (1981–2010 averages, extremes 1987−present)