Climate Castelnau-Magnoac experiences an
oceanic climate (
Köppen climate classification Cfb). The average annual temperature is , with May being the wettest month. The average annual rainfall totals . August is typically the warmest month, with average temperatures around , while January is the coldest, averaging . The highest temperature ever recorded in Castelnau-Magnoac was on 13 August 2003. The coldest recorded temperature was on 25 December 2001. {{Weather box|width=auto ... ==See also==