condition mean min max 4 h after light 87.7 87.7 87.7 8 h after light 78.65 74.2 83.1 12 h after light 55.5 49.9 61.1 4 h after dark 78.7 65.2 92.2 8 h after dark 98.45 78.9 118.0 12 h after dark 109.85 103.0 116.7