condition mean min max 4 h after light 16.708 15.3844 18.0316 8 h after light 17.21165 17.1548 17.2685 12 h after light 19.16055 17.3021 21.019 4 h after dark 23.59745 20.435 26.7599 8 h after dark 17.873350000000002 17.5545 18.1922 12 h after dark 17.7132 16.7287 18.6977