condition mean min max 2 h after light 9.896893333333333 7.36337 11.5688 6 h after light 10.878423333333334 6.80708 13.0911 10 h after light 11.402925 5.01988 14.2105 14 h after light 13.61201 9.00626 17.6024 18 h after light 16.457568333333334 8.91871 21.2837 2 h after dark 10.158479999999999 7.27791 15.314