condition mean min max 0 h after light 16.78155 16.317 17.2461 4 h after light 15.7023 15.4805 15.9241 8 h after light 43.13415 38.8728 47.3955 4 h after dark 40.39465 33.7397 47.0496 8 h after dark 30.4229 28.6277 32.2181 12 h after dark 17.3786 16.7141 18.0431