Climate refers to the long-term average of weather patterns—such as temperature, precipitation, humidity, and wind—in a particular region over decades. The word 气候 combines two characters: 气 (qì), meaning 'air' or 'atmosphere', and 候 (hòu), meaning 'seasonal phase' or 'periodic natural condition'. Together, they convey the idea of recurring atmospheric conditions characteristic of a place across time—not just daily weather, but the broader, stable pattern that defines regions like tropical, arid, or temperate zones.

This term is commonly used in geography, environmental science, travel planning, and discussions about climate change. It appears in formal and academic contexts more often than in casual speech, where people might say 天气 (tiānqì, 'weather') instead. 气候 carries no emotional connotation—it’s a neutral, descriptive scientific term—and it’s always treated as an uncountable noun in Chinese, never used with measure words like 个 or 种 unless explicitly quantified (e.g., 一种气候).