condition mean min max 0 h after light 5.17938 4.27952 6.07924 4 h after light 8.672685 6.96577 10.3796 8 h after light 6.74221 5.5193 7.96512 4 h after dark 9.942595 9.39629 10.4889 8 h after dark 6.01185 5.87458 6.14912 12 h after dark 8.118385 7.70444 8.53233