condition mean min max 4 h after light 7.07987 6.63971 7.52003 8 h after light 7.824299999999999 7.60673 8.04187 12 h after light 9.585555 8.97111 10.2 4 h after dark 9.777255 9.77109 9.78342 8 h after dark 8.899235000000001 8.87328 8.92519 12 h after dark 8.879095 8.5398 9.21839