condition mean min max 3 h after light 8.43556 7.81221 9.67203 6 h after light 10.57237 8.87641 12.3386 9 h after light 13.0897 12.5752 13.9487 12 h after light 15.114775 13.8311 16.6415 3 h after dark 16.8291 15.1998 18.1886 6 h after dark 15.068466666666666 13.9488 16.7766 9 h after dark 9.37059 6.90291 11.5921 12 h after dark 12.102049999999998 11.6276 12.5765