condition mean min max 4 h after light 6.988275 4.50638 9.47017 8 h after light 7.13785 4.2018 10.0739 12 h after light 9.7499 9.1135 10.3863 4 h after dark 12.41034 9.42931 18.3197 8 h after dark 10.8307 9.6219 12.2596 12 h after dark 19.978333333333335 16.7939 24.5069