condition mean min max 4 h after light 45.9 45.9 45.9 8 h after light 67.7 62.9 72.5 12 h after light 61.45 60.3 62.6 4 h after dark 15.7 9.1 22.3 8 h after dark 23.85 14.7 33.0 12 h after dark 16.9 8.6 25.2