condition mean min max 4 h after light 7.800418 7.412272 8.188564 8 h after light 8.8348805 8.813846 8.855915 12 h after light 7.9784 7.957444 7.999356 4 h after dark 8.222653999999999 8.188564 8.256744 8 h after dark 8.6373115 8.605562 8.669061 12 h after dark 7.463712 7.463712 7.463712