condition mean min max 4 h after light 2105.2 2105.2 2105.2 8 h after light 2046.55 1892.4 2200.7 12 h after light 1989.6 1726.0 2253.2 4 h after dark 1520.45 1513.5 1527.4 8 h after dark 1454.95 1348.4 1561.5 12 h after dark 1198.95 1127.4 1270.5