condition mean min max 4 h after light 23.3691015 21.049728 25.688475 8 h after light 18.3346095 16.805697 19.863522 12 h after light 19.613678 18.96961 20.257746 4 h after dark 18.6963515 17.744462 19.648241 8 h after dark 18.310145499999997 17.574837 19.045454 12 h after dark 17.320141 17.320141 17.320141