condition mean min max 4 h after light 9.9114975 9.842132 9.980863 8 h after light 9.5948215 9.271289 9.918354 12 h after light 9.9906015 9.918354 10.062849 4 h after dark 9.833905 9.792168 9.875642 8 h after dark 10.0859265 9.618889 10.552964 12 h after dark 10.0619 10.0619 10.0619