condition mean min max 3 h after light 18.1465 17.1195 19.4711 6 h after light 16.0628 11.7698 19.8892 9 h after light 18.0322 16.4971 20.8168 12 h after light 23.691 16.1661 28.9701 3 h after dark 26.997233333333334 25.6867 27.6994 6 h after dark 22.636066666666668 19.8782 25.2284 9 h after dark 15.991966666666666 14.6038 18.7233 12 h after dark 11.74315 11.064 12.4223