Final answer:
The correct verb to complete the sentence is "hace." It is used to describe weather conditions in Spanish.
Step-by-step explanation:
The correct verb to complete the sentence is hace.
En otoño hace viento.
This sentence translates to "In autumn, it is windy." The verb "hace" is used to express weather conditions, such as temperature, wind, and rain. In this case, it is used to describe the windy weather during autumn.
Learn more about Verb usage in Spanish