Ceillac has a humid continental climate (Köppen climate classificationDfb). The average annual temperature in Ceillac is 6.2 °C (43.2 °F). The average annual rainfall is 761.6 mm (29.98 in) with October as the wettest month. The temperatures are highest on average in July, at around 15.4 °C (59.7 °F), and lowest in January, at around −1.5 °C (29.3 °F). The highest temperature ever recorded in Ceillac was 31.6 °C (88.9 °F) on 27 June 2019; the coldest temperature ever recorded was −24.0 °C (−11.2 °F) on 10 February 1986.
Climate data for Ceillac (1981–2010 averages, extremes 1951−present)