condition mean min max 0 h after light 18.14385 17.5794 18.7083 4 h after light 14.062 13.3486 14.7754 8 h after light 16.12015 15.5009 16.7394 4 h after dark 18.10065 17.9223 18.279 8 h after dark 17.1167 16.9971 17.2363 12 h after dark 16.974800000000002 16.8595 17.0901