They are everywhere,thestaton said:
Commercial electric supply stores & antenna companies in your area are sources.
Try relocating the switch indoors.
The other idea I have seen is a plastic tool box......Screw the bottom to the wall or pole so it is vertical....vent the new bottom so water can drain....run cables in from below. The door will give access and is watertight enough and varmit proof.
Even plastic refrigerator boxes will work but the UV issue will break them down.
You don't want a complete seal that will trap moisture...just deflect running water and snow. Use sponge to keep bugs from making nests.
Joe