While the rain itself will have no impact on the panels, the rain clouds will likely lower your production. However, the occasional rainstorm could actually be good for your solar system’s production, because it’s a no-fuss, safe way to clean your panels. Consistent rainstorms keep a layer of dirt or dust from covering the panels and help to keep them clean..
Snow or ice buildup on top of the solar panel is unlikely to cause damage—panels are strong enough to withhold extra weight and they are built to be waterproof to protect the electronic components on the inside. Snow and ice accumulation could prevent the panels from receiving as much sunlight, which would limit their power production and efficiency. But, in most cases, the snow will melt off the panels much more quickly than the surrounding regions of the roof so this isn’t a huge concern.