Hey there,
Your question states: What types of local winds would you experience if you were standing in a valley at night?
The type of local winds would you experience if you were standing in a valley at night would be like a [tex]\boxed{valley \ breeze}[/tex]. Based on my research, when attending the valley of any sort, you would not really see like 10 MPH winds, there winds are not powerful at all. They are little breeze that feel good. That it why your answer is Breeze :)
~Jurgen
