condition mean min max 4 h after light 153.355 152.903 153.807 8 h after light 194.8645 194.271 195.458 12 h after light 156.389 142.742 170.036 4 h after dark 309.4655 296.405 322.526 8 h after dark 233.185 228.849 237.521 12 h after dark 261.695 260.384 263.006