condition mean min max 4 h after light 15.009949 12.929043 17.090855 8 h after light 14.0904785 13.893713 14.287244 12 h after light 15.254562499999999 12.592957 17.916168 4 h after dark 13.044874499999999 12.196036 13.893713 8 h after dark 18.496717 12.575589 24.417845 12 h after dark 17.156443 17.156443 17.156443