condition mean min max 4 h after light 16.8367 16.6855 16.9879 8 h after light 12.49795 12.2411 12.7548 12 h after light 12.253 11.9276 12.5784 4 h after dark 14.3869 13.4532 15.3206 8 h after dark 13.67875 13.5924 13.7651 12 h after dark 15.8106 15.0409 16.5803