condition mean min max 4 h after light 8.497845 7.25484 9.74085 8 h after light 10.14663 9.55386 10.7394 12 h after light 10.80185 10.0788 11.5249 4 h after dark 13.5075 12.5559 14.4591 8 h after dark 12.2533 12.1248 12.3818 12 h after dark 11.7314 11.3945 12.0683