condition mean min max 0 h after light 18.3258 17.6894 18.9622 4 h after light 7.439115 7.3604 7.51783 8 h after light 5.23898 4.96301 5.51495 4 h after dark 6.81221 6.72691 6.89751 8 h after dark 10.1711 10.0788 10.2634 12 h after dark 15.355599999999999 11.1733 19.5379