condition mean min max 0 h after light 9.30632 9.17176 9.44088 4 h after light 18.642400000000002 17.8022 19.4826 8 h after light 88.56020000000001 83.2656 93.8548 4 h after dark 70.97325000000001 54.2893 87.6572 8 h after dark 36.92335 34.6221 39.2246 12 h after dark 17.82026 9.28382 26.3567