condition mean min max 4 h after light 255.6 255.6 255.6 8 h after light 233.25 217.9 248.6 12 h after light 198.8 172.6 225.0 4 h after dark 216.25 198.1 234.4 8 h after dark 258.05 175.1 341.0 12 h after dark 308.75 258.6 358.9