Le Poizat-Lalleyriat has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Le Poizat-Lalleyriat is 8.3 °C (46.9 °F). The average annual rainfall is 1,752.5 mm (69.00 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 0.0 °C (32.0 °F). The highest temperature ever recorded in Le Poizat-Lalleyriat was 37.5 °C (99.5 °F) on 31 July 1983; the coldest temperature ever recorded was −22.5 °C (−8.5 °F) on 9 January 1985.
Climate data for Lalleyriat, Le Poizat-Lalleyriat (1981–2010 averages, extremes 1981−1997)
^"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 22 November 2022.