condition mean min max 4 h after light 5.041676666666667 3.27668 6.54525 8 h after light 2.20749 0.61574 3.31986 12 h after light 2.31661 1.29283 2.83378 4 h after dark 4.06716 3.27964 5.34326 8 h after dark 7.847053333333333 6.30758 10.7033 12 h after dark 18.08363333333333 17.0448 19.1414