I sit here under a fiberglass roof, in a downpour.
TV turns on, sets channel.
I find my self having to set the volume level manually.
Discount the current rain, and the volume would be set by the amount of power being drawn by the fans in earshot.
What easy device that HE can interface with will allow me to use "ambient noise level" rather than "power"?
Although, at the moment I doubt that it can be heard over the rain!
Doesn't measure sound, but you could always get a weather station and link that to adjust volume based upon rain occurring.
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Always have wanted one.
I am getting drizzle, then downpour, then drizzle, then break in the rain.
Hoping to be able to follow the rain intensity with the volume.
Having no experience with the info from any weather station, is this possible?
Several measure the rainfall "rate" per hour, two that I've used the Ambient Weather 2902 and (currently) Weatherflow, do this and you should be able to write a rule to trigger based upon that rate being a certain amount and above.
I've personally never had a rule like this, but those attributes of the devices so it should be possible.
I've never had a station but it seems to me that there must be a substantial lag in reporting the rain rate, no? If so then the volume adjust would be annoyingly late, no?
About 60 seconds tops with weatherflow, probably around 2 minutes with ambient weather if I remember correctly.
It's merely an alternative way to skin the cat, as I don't know of any smart decibel meters, not to say they don't exist.
Another issue I see with the OP's approach is that the TV itself will be contributing to the overall sound level unless it is cancelled by some other input, like a audio out that varies with the TV volume.
It might be easier and less expensive to get a new roof! 
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The netatmo home health monitor is the only device Iām aware of that can be integrated with HE and has a decibel sound level sensor.
I don't know where to get such a sensor but I would think an acceleration sensor attached right to the roof would be able to provide information in real time.
The only way I know to do such a thing would be with an Arduino type board with either HubDuino or the Haas Zigbee board.
Not real hip on Arduino route.
Someday, although the weather station has multiple benefits, hurricane season is right around the corner!
Had hoped for simple "z" solution.
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