Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

climatology
     n : meteorology of climates and their phenomena