condition mean min max 4 h after light 38.0533 37.9569 38.1497 8 h after light 20.49005 19.6443 21.3358 12 h after light 19.40745 18.8682 19.9467 4 h after dark 16.83905 16.5315 17.1466 8 h after dark 17.595 17.0887 18.1013 12 h after dark 26.34975 26.249 26.4505