condition mean min max 4 h after light 7.824555 7.65687 7.99224 8 h after light 6.168505 5.95102 6.38599 12 h after light 11.856349999999999 10.799 12.9137 4 h after dark 15.4982 15.2309 15.7655 8 h after dark 23.6928 22.7318 24.6538 12 h after dark 16.458599999999997 16.2046 16.7126