I would never recommend using a fine gun to drive in tent stakes or such however I have used my (expensive for my wallet anyway) guns in some awful weather. Once while hunting (grouse&woodcock) in Vermont my Parker spent some time at the bottom of a small creek as a result of my trying an ill advised crossing of said waterway. After dumping the water out I hunted the rest of the day. That evening a complete disassembly, cleaning and oiling. With proper care, weather won't hurt it. Use it but don't abuse it.
Vern