From Greek 'klima' (inclination), from 'klinein' (to lean) — Greeks classified weather by the sun's angle at each latitude.
The weather conditions prevailing in an area in general or over a long period; also, the prevailing attitudes or conditions in a given situation.
From Late Latin 'clīma' (region, zone of the earth), from Greek 'klíma' (inclination, slope, latitude zone), from 'klínein' (to lean, to slope, to incline), from PIE *ḱley- (to lean, to incline). The ancient Greeks believed that the Earth's surface sloped from the equator toward the pole, and they divided the known world into 'klímata' (zones of inclination, latitudinal bands) based on the angle of the sun. Each 'klíma' had characteristic weather, so the word shifted from 'angle of latitude