condition mean min max 4 h after light 12.9 12.9 12.9 8 h after light 16.65 14.0 19.3 12 h after light 14.7 13.6 15.8 4 h after dark 13.7 12.1 15.3 8 h after dark 19.45 19.0 19.9 12 h after dark 52.9 23.8 82.0