condition mean min max 4 h after light 64.8 64.8 64.8 8 h after light 69.0 64.3 73.7 12 h after light 73.55 59.1 88.0 4 h after dark 76.05 46.4 105.7 8 h after dark 127.4 111.3 143.5 12 h after dark 79.8 8.5 151.1