condition mean min max 4 h after light 34.6229 34.1658 35.08 8 h after light 18.26545 17.7128 18.8181 12 h after light 6.76706 6.18351 7.35061 4 h after dark 10.8884 10.687 11.0898 8 h after dark 14.9561 14.6245 15.2877 12 h after dark 21.82715 21.7452 21.9091