condition mean min max 4 h after light 18.84935 17.9933 19.7054 8 h after light 18.853 17.578 20.128 12 h after light 21.177599999999998 20.9341 21.4211 4 h after dark 23.9366 23.1593 24.7139 8 h after dark 20.6711 20.4623 20.8799 12 h after dark 19.4223 18.6753 20.1693