Here are some advices I can give it to you:
1. Don't go to the wild sections if possible.
2. If you would like to make an exploration to the wild section, you'd better consult the weather forecast in advance. Don't go to the wall in rain, storm or snow days.
3. In case it rains or thunders over the wall while you are visiting, go to the nearest beacon tower for shelter, but go in small steps as big steps would cause step voltage. Close all wireless communications such as cell phones, broadcast and even cameras, wait until the rain stops.