I prefer smooth air. Sometimes, the wind is blowing rather hard, but it isn't gusty and it seems rather laminar or smooth. Often obstacles like trees and buildings will create turbulence around themselves and make a pleasant day seem bumpy.
A good field can be sheltered from the ambient wind . If your field seems turbulent on days with light winds, just look around and see what trees or buildings may be causing the airflow to be turbulent. Rollers and eddies, down drafts and up drafts flowing around fixed objects can create turbulence. A nice open area can have rather high wind speeds, but the air can seem smooth all the way to the ground.
Also colors can create updrafts and thermals. I dark plowed field near a cool green pasture can be relatively warmer and create an updraft or thermal. Passing through the boundary between these air masses can seem bumpy.
Terrain like hills or or ridges can cause rollers to form downwind.
SO. Someone in an open field in Nebraska might find that 15 knots of wind is nothing to be upset about. That same 15 knots might be a handful at another field with obstacles and uneven terrain.