condition mean min max 4 h after light 13.3928 11.9133 14.8723 8 h after light 10.543895 9.66589 11.4219 12 h after light 11.424 10.9294 11.9186 4 h after dark 16.1893 15.5633 16.8153 8 h after dark 16.45025 15.8629 17.0376 12 h after dark 17.267 16.7242 17.8098