Hot air rises . Slowly rises. In fact, all of the US south of the Mason-Dixon line is in the same latitude region known as the Doldrums off of the west coast of Africa. Ships were marooned there for days and weeks with no winds.
Honestly, and I have seen a few of these, most windmills would work best if they captured rising hot air instead of harnessing lateral wind movement - at least in the south.
Like solar farms where the panels rotate towards the sun throughout the day, maybe use rising heat during low and high wind days, and rotate to use lateral wind movement between those two.