"related to or connected with climatology," 1827, from climatology + -ical. Related: Climatologically.
Entries linking to climatological
climatology n.
"scientific study of climates," 1803, from climate + -ology. In 19c., more or less equivalent to meteorology.
-ical
compound adjectival word-forming element, usually interchangeable with -ic but sometimes with specialized sense (such as historic/historical, politic/political), Middle English, from Late Latin -icalis, from Latin -icus + -alis (see -al (1)). Probably it was needed because the forms in -ic often took on a noun sense (for example physic). Forms in -ical tend to be attested earlier in English than their twins in -ic.