You will get fog even in rain, but the rain will break it up faster. The better protected, the longer it will last. I've fogged in a hard rain, and it still looked pretty nice and odd as some lingered in strange areas.
Your main problem is to protect the fogger unit itself. Even if it's a cheapy $20 one, with very little effort, you can still have fog and not have to sacrifice the equipment.
Put the fogger in a sheltered area, protect it from water and you should still see a decent effect.
For rain, I place my fogger up on bricks, and then have a black garbage bag that has plant stakes at the four corners and maybe place a brick on top to keep the plastic from coming in contact with the fogger body (it gets HOT so you don't want melted plastic!). The bag makes a tent and keeps the fogger's electronics protected. If you are having wind, you might need to make a lean-to type tent using a structure like a step, part of the house, etc... for the best protection.
There's an added bonus that the bag hides the fogger. I put it in some bushes near my front door, and nobody ever sees it unless it's actively fogging.
If you need to get the fog to another area, dryer vent hose (painted black) works well to pipe the fog to where you need it - but it needs to be within 10 feet or so as the fog looses momentum after that.
Good luck!
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I'm a Halloween Bride! 10/31/2002
Where there is no imagination there is no horror.
~Sir Arthur Conan Doyle
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