condition mean min max 4 h after light 3279.1 3279.1 3279.1 8 h after light 3018.45 2978.4 3058.5 12 h after light 2958.95 2876.2 3041.7 4 h after dark 2706.8 2648.4 2765.2 8 h after dark 2212.15 1831.9 2592.4 12 h after dark 1859.75 1765.0 1954.5