condition mean min max 4 h after light 37.58475 34.585 40.5845 8 h after light 17.81725 17.3562 18.2783 12 h after light 11.19891 8.46032 13.9375 4 h after dark 15.43225 14.2433 16.6212 8 h after dark 15.9432 15.4864 16.4 12 h after dark 25.3893 23.071 27.7076