condition mean min max 4 h after light 218.1 218.1 218.1 8 h after light 147.2 131.0 163.4 12 h after light 182.7 176.4 189.0 4 h after dark 181.45 177.5 185.4 8 h after dark 196.45 165.1 227.8 12 h after dark 239.55 226.7 252.4