condition mean min max 4 h after light 106.9 106.9 106.9 8 h after light 109.6 108.4 110.8 12 h after light 131.95 105.9 158.0 4 h after dark 193.55 171.2 215.9 8 h after dark 145.0 133.6 156.4 12 h after dark 141.7 127.5 155.9