condition mean min max 4 h after light 1.2 1.2 1.2 8 h after light 20.65 16.1 25.2 12 h after light 30.1 29.8 30.4 4 h after dark 12.9 2.7 23.1 8 h after dark 10.8 4.4 17.2 12 h after dark 20.4 13.5 27.3