Yes, Christmas lights can get wet, but it's not recommended as it can damage the electrical components and increase the risk of electrical shock. It's best to keep Christmas lights dry and away from rain, snow, or other sources of moisture. If you must use Christmas lights in a wet environment, it's important to use outdoor-rated lights and to keep them away from any electrical outlets. It's also a good idea to unplug the lights when they're not in use, especially if there's a chance of rain.