condition mean min max 4 h after light 5.57745 4.24198 6.91292 8 h after light 13.23425 12.7493 13.7192 12 h after light 30.46775 28.5336 32.4019 4 h after dark 34.5077 29.209 39.8064 8 h after dark 19.8596 19.7904 19.9288 12 h after dark 11.4933 10.6345 12.3521