Final answer:
The narrator anticipates the summer winds because she hopes to witness the return of the enigmatic carnival that previously appeared and disappeared without trace.
Step-by-step explanation:
The narrator in 'An Unexplainable Occurrence' by Elizabeth Kibler most likely waits for the summer winds to blow because she wants to see if the carnival comes again. This anticipation is grounded in the mysterious nature of the carnival's previous visit, which left no trace and had citizens puzzled about its existence. The choice to await the summer winds indicates a sense of hope and curiosity over whether the carnival's magical appearance was a one-time event or if it will return with the summer season.