condition mean min max 3 h after light 19.3936 17.381 22.1244 6 h after light 14.5046 9.253 18.3534 9 h after light 17.101933333333335 15.2764 18.5858 12 h after light 19.6182 15.4598 22.6365 3 h after dark 19.863066666666665 16.7749 23.8642 6 h after dark 21.36606666666667 20.98 21.5924 9 h after dark 20.9861 19.9613 22.3722 12 h after dark 17.4672 11.1212 23.8132