condition mean min max 4 h after light 20.0 20.0 20.0 8 h after light 29.75 18.2 41.3 12 h after light 38.25 33.6 42.9 4 h after dark 37.55 23.5 51.6 8 h after dark 47.55 43.8 51.3 12 h after dark 29.4 13.8 45.0