condition mean min max 4 h after light 19.674 18.8198 20.5282 8 h after light 14.24485 13.9206 14.5691 12 h after light 15.09555 14.5154 15.6757 4 h after dark 17.519099999999998 17.2438 17.8483 8 h after dark 19.4403 18.4823 20.1844 12 h after dark 20.202866666666665 19.4516 21.6002