condition mean min max 4 h after light 7.983505 7.35553 8.61148 8 h after light 9.516705 8.71241 10.321 12 h after light 6.6536349999999995 5.99433 7.31294 4 h after dark 6.699666666666666 6.41404 6.9859 8 h after dark 7.47698 6.77734 7.90607 12 h after dark 8.242033333333334 7.01418 9.88374