condition mean min max 4 h after light 279.4 279.4 279.4 8 h after light 231.8 182.5 281.1 12 h after light 173.45 156.2 190.7 4 h after dark 184.6 123.0 246.2 8 h after dark 174.35 151.2 197.5 12 h after dark 192.35 174.2 210.5