condition mean min max 4 h after light 9.58692 9.554486 9.619354 8 h after light 9.089295 8.669432 9.509158 12 h after light 9.2264345 8.791911 9.660958 4 h after dark 10.0465525 9.851926 10.241179 8 h after dark 8.8240455 8.808464 8.839627 12 h after dark 10.53932 10.53932 10.53932