condition mean min max 4 h after light 15.127865 14.495029 15.760701 8 h after light 15.6131815 15.465662 15.760701 12 h after light 13.792217 13.679553 13.904881 4 h after dark 16.542041 16.088415 16.995667 8 h after dark 18.1154455 15.760701 20.47019 12 h after dark 14.313571 14.313571 14.313571