condition mean min max 4 h after light 85.5 85.5 85.5 8 h after light 82.35 68.7 96.0 12 h after light 84.6 55.7 113.5 4 h after dark 54.65 46.0 63.3 8 h after dark 57.25 47.9 66.6 12 h after dark 91.2 81.7 100.7