condition mean min max 4 h after light 9.7 9.7 9.7 8 h after light 7.0 6.7 7.3 12 h after light 7.55 6.6 8.5 4 h after dark 11.15 10.9 11.4 8 h after dark 26.15 11.3 41.0 12 h after dark 9.2 6.2 12.2