condition mean min max 4 h after light 14.12185 13.1866 15.0571 8 h after light 15.5593 14.8513 16.2673 12 h after light 14.1187 13.6622 14.5752 4 h after dark 22.10885 19.7013 24.5164 8 h after dark 17.2462 17.0993 17.3931 12 h after dark 16.9381 16.5572 17.319