condition mean min max 4 h after light 16.76864 5.24102 29.8204 8 h after light 9.54337 1.33052 17.8395 12 h after light 8.39042 4.46323 14.215 4 h after dark 17.326166666666666 10.1232 22.6155 8 h after dark 17.514499999999998 8.2043 23.561 12 h after dark 19.943733333333334 10.3435 35.4494