condition mean min max 4 h after light 145.1 145.1 145.1 8 h after light 174.05 149.0 199.1 12 h after light 187.6 179.2 196.0 4 h after dark 137.45 111.2 163.7 8 h after dark 133.75 128.6 138.9 12 h after dark 152.0 149.2 154.8