condition mean min max 4 h after light 11.46425 11.0066 11.9219 8 h after light 11.573 10.7991 12.3469 12 h after light 6.091935 4.49028 7.69359 4 h after dark 5.864255 5.0936 6.63491 8 h after dark 8.34492 7.83832 8.85152 12 h after dark 8.620315 8.22772 9.01291