condition mean min max 4 h after light 14.635 10.6251 18.4116 8 h after light 14.600166666666667 6.5667 19.4375 12 h after light 15.5704 12.7219 19.1023 4 h after dark 18.1375 17.679 18.8269 8 h after dark 16.555566666666664 15.0634 17.3556 12 h after dark 14.781 10.5507 20.4227