condition mean min max 4 h after light 131.6125 111.355 151.87 8 h after light 510.307 501.271 519.343 12 h after light 963.014 941.243 984.785 4 h after dark 896.218 818.016 974.42 8 h after dark 814.287 758.772 869.802 12 h after dark 379.955 348.881 411.029