The Collaborative International Dictionary of English v.0.48:
Climatology \Cli`ma*tol"o*gy\, n. [Climate + -logy: cf. F. climatologie.] The science which treats of climates and investigates their phenomena and causes. --Brande & C. [1913 Webster]WordNet (r) 3.0 (2006):
climatology n 1: meteorology of climates and their phenomena