condition mean min max 4 h after light 8.1660165 7.788937 8.543096 8 h after light 8.6507265 7.847117 9.454336 12 h after light 7.827211 7.772087 7.882335 4 h after dark 8.792345000000001 8.672822 8.911868 8 h after dark 8.864051 8.130646 9.597456 12 h after dark 7.786597 7.786597 7.786597