https://www.usga.org/course-care/201...474858685.html
"Summer months bring warm, humid conditions that cause the turf to grow at an accelerated pace. Some golf facilities maintain slightly lower mowing heights during the summer months to improve aesthetics and playability. Fairways can be mowed from 0.38 to 0.45 inches while roughs are maintained between 1.0 to 1.25 inches in summer. Mowing heights are raised slightly in the fall, as soil temperatures decrease and the turf thins from peak season cart traffic. Mowing height can be increased to as high as 0.7 inches in fairways and up to 2.0 inches in roughs to improve conditions for the peak golfing season."
"Fairways are generally maintained at 0.5 inch throughout most of the year. Lower mowing increases shoot tillering which increases leaf density, and this provides a “tighter” playing surface as the golf ball sits higher in the turf canopy. Conversely, higher mowing provides a more cushioned ball lie where the ball nestles down further into the turf canopy."
Steve