The word "weather-wise" is a modern English compound formed by combining the noun "weather" with the suffix "-wise." The term "weather" originates from the Proto-Germanic wedrą, meaning "wind, weather," which itself may derive from the Proto-Indo-European root we-dhro-, meaning "to blow." The suffix "-wise," in its sense of "knowledgeable," evolved from the Old English adjective wīs (wise) and its related suffix -wīs (manner). The compound logic is transparent: someone who is "weather-wise" is skilled in the ways or knowledge of the weather. This pattern of creating adjectives with "-wise" to denote expertise in a specific area (e.g., "streetwise," "business-wise") became productive in the 19th and 20th centuries, reflecting a straightforward method for generating descriptive terms for practical knowledge.

Structure: weather (atmospheric conditions) + wise (skilled in) - weather: From Old English weder, meaning "air, sky, breeze, storm, weather." Its functional role is the core noun stem denoting the subject matter. - wise: From Old English -wīs, meaning "manner, way." In this compound, it functions as a suffix meaning "having knowledge or skill in a particular domain."