condition mean min max 4 h after light 9.424795 7.97719 10.8724 8 h after light 12.2286 11.9139 12.5433 12 h after light 16.60125 15.9588 17.2437 4 h after dark 17.95495 17.8928 18.0171 8 h after dark 15.748999999999999 14.92 16.578 12 h after dark 15.6767 14.3255 17.0279