condition mean min max 4 h after light 237.3 237.3 237.3 8 h after light 225.0 213.9 236.1 12 h after light 208.45 196.5 220.4 4 h after dark 174.45 172.8 176.1 8 h after dark 220.1 190.6 249.6 12 h after dark 256.35 246.6 266.1