condition mean min max 4 h after light 961.4 961.4 961.4 8 h after light 775.75 712.5 839.0 12 h after light 859.3 767.6 951.0 4 h after dark 920.25 761.4 1079.1 8 h after dark 979.55 823.5 1135.6 12 h after dark 1106.45 1086.4 1126.5