condition mean min max 4 h after light 8162.2 8162.2 8162.2 8 h after light 9145.55 9035.3 9255.8 12 h after light 8312.7 7146.4 9479.0 4 h after dark 7835.2 7481.7 8188.7 8 h after dark 6232.45 5520.4 6944.5 12 h after dark 4986.9 4802.5 5171.3