condition mean min max 0 h after light 20.7643 18.4646 23.064 4 h after light 16.7358 16.0653 17.4063 8 h after light 15.631 14.0153 17.2467 4 h after dark 20.759999999999998 17.448 24.072 8 h after dark 23.504199999999997 21.4242 25.5842 12 h after dark 19.461199999999998 19.1992 19.7232