condition mean min max 4 h after light 34.47485 31.8724 37.0773 8 h after light 22.97935 22.6505 23.3082 12 h after light 18.0704 17.7026 18.4382 4 h after dark 19.39645 18.9649 19.828 8 h after dark 24.24615 24.0128 24.4795 12 h after dark 27.6445 27.1877 28.1013