condition mean min max 4 h after light 17.8 17.8 17.8 8 h after light 17.75 4.9 30.6 12 h after light 20.35 14.6 26.1 4 h after dark 25.5 2.4 48.6 8 h after dark 8.3 3.3 13.3 12 h after dark 13.65 1.5 25.8