condition mean min max 0 h after light 11.8286 11.3596 12.2976 4 h after light 8.736365 8.64511 8.82762 8 h after light 9.349335 9.29866 9.40001 4 h after dark 8.96324 8.85213 9.07435 8 h after dark 9.316905 8.7865 9.84731 12 h after dark 9.55789 7.84988 11.2659