condition mean min max 0 h after light 6.106695 5.53959 6.6738 4 h after light 7.166345 7.144 7.18869 8 h after light 8.41231 7.95813 8.86649 4 h after dark 10.069514999999999 9.77663 10.3624 8 h after dark 9.61717 9.46894 9.7654 12 h after dark 8.564045 8.12475 9.00334