Final answer:
Act V of Cyrano de Bergerac occurs during autumn, reflecting a time of change and reflection for the characters.
Step-by-step explanation:
Act V of Cyrano de Bergerac by Edmond Rostand takes place during the autumn. This final act depicts the characters fifteen years after the events of the previous acts, showing a significant time jump and a change in the characters' circumstances. The season's presence is felt in the melancholic and reflective mood of the characters as they prepare to face the closing of both the year and the final chapter of their lives.