cool-weather

The compound adjective 'cool-weather' is a modern English formation combining two native Germanic elements. 'Cool' derives from the Old English 'cōl', meaning moderately cold, which has cognates across Germanic languages. 'Weather' originates from the Old English 'weder', referring to air, sky, or storm, a term with deep Proto-Indo-European roots related to wind. The compound logically describes conditions characterized by a lack of warmth, directly linking the literal, sensory quality of 'cool' with the environmental state of 'weather' to specify a climatic type.

Structure: cool (adjective) + weather (noun) 'cool' is from Middle English 'cole', of Germanic origin. 'weather' is from Old English 'weder', of Germanic origin.