condition mean min max 4 h after light 43.206 40.8208 45.5912 8 h after light 24.62145 23.9025 25.3404 12 h after light 22.3093 22.0622 22.5564 4 h after dark 24.83455 22.0543 27.6148 8 h after dark 31.9814 31.3197 32.6431 12 h after dark 41.67655 41.4985 41.8546