The six influences liù yín · 六淫

Wind, Cold, Summer-heat, Damp, Dryness and Fire are six descriptions of how external conditions are said to interact with the body. Wind is the most abstract: it describes signs that move around or come on suddenly.

Read them as descriptions of patterns, not as weather-based causes in a modern sense. Damp, for instance, describes heaviness and sluggishness — a set of features, not humidity itself.