Perhaps the turbulence rationale has more to do with passengers being able to handle the turbulence better when their body isn't already stressed because they are overheated? Less likely to get seasick/airsick when the body is cooler??
I never thought about that angle, but even though it's a stretch, I'll buy it.
"Travel is fatal to prejudice, bigotry and narrow-mindedness" - Mark Twain
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather, to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming...WOW, What a Ride!"