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OK, well, I got excoriated for making a suggestion, but I'll throw another one out there:
Get a big sheet of corrugated steel as used for roofing material. Put it out in the yard, up on four cinder blocks, in a place where the rain can hit it. Voila! lots of rain sound!
Avoid the whole baby monitor nonsense. They aren't designed for outdoor use, so can't be relied on. Water and unprotected electronics simply do not mix. This wouldn't be high voltage/current issue, but it's still a bad idea.
I'd personally find an outdoor microphone designed for humidity, that is wireless (say Bluetooth). Send the audio signal inside to a sound system. If not wireless, have one with a flat cord. Either one would still need power, but maybe a battery model would be available.
Or, get one of those sound generators, and have rain sounds available 24/7.
Or, run sounds from YouTube over a phone, computer, or sound system.
Go to Salvation Army and get a $20 stereo receiver with a proper phono input, then hook up a pair of identical microphones to said input, put the microphones outside and crank the stereo up. If it has Pro Logic and you have enough speakers, try it. You might want to roll off some of the bass and boost the treble to offset the RIAA equalisation curve the stereo's likely hard-wired for.
It has been done before.
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