condition mean min max 4 h after light 8.41804 8.123510000000001 8.636339999999999 8 h after light 8.57888 8.51988 8.646410000000001 12 h after light 7.802973333333333 7.712619999999999 7.9161 4 h after dark 8.717666666666666 8.58853 8.8497 8 h after dark 8.69026 8.56851 8.782789999999999 12 h after dark 8.31578 7.979080000000001 8.573889999999999