condition mean min max 4 h after light 13.11375 10.698 15.5295 8 h after light 17.61305 16.7676 18.4585 12 h after light 19.84265 18.6231 21.0622 4 h after dark 30.8136 29.4708 32.1564 8 h after dark 27.1356 25.8451 28.4261 12 h after dark 21.4292 20.7951 22.0633