Can a grandfather clock be placed on an outside wall of a house?

Yes, a grandfather clock can be placed on an outside wall of a house, but it is generally not recommended. Exposure to outdoor elements such as temperature fluctuations, humidity, and direct sunlight can damage the clock's mechanical parts and finish. If it must be placed outside, ensure it is in a sheltered area, protected from the weather, and consider using a weatherproof clock designed for outdoor use.