condition mean min max 4 h after light 1.5 1.5 1.5 8 h after light 4.2 3.6 4.8 12 h after light 12.100000000000001 4.6 19.6 4 h after dark 19.0 5.3 32.7 8 h after dark 22.3 2.1 42.5 12 h after dark 4.75 4.7 4.8