condition mean min max 4 h after light 8.30328 4.92945 10.905 8 h after light 6.700823333333333 1.70461 11.0907 12 h after light 8.344353333333334 4.61926 13.1689 4 h after dark 13.430743333333334 8.76673 17.3318 8 h after dark 14.7468 10.5954 18.8327 12 h after dark 17.8828 15.4077 19.2812