condition mean min max 4 h after light 17.5 17.5 17.5 8 h after light 15.3 15.0 15.6 12 h after light 19.4 13.0 25.8 4 h after dark 19.3 12.4 26.2 8 h after dark 25.2 7.6 42.8 12 h after dark 13.350000000000001 10.4 16.3