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The implications of the weather or the conditions of the enviroment could effect the system or the sound in two main ways.
1. Technically - if you live by the sea and a lot of salty-humid wind gets to the components it can damage it.
I've lived in Nahariya when I was a kid and I remember a TV that was blown because of corosion on the high-voltage circuits.
2. Sound - Air Pressure, Temperature and humidity effect the speed of diffirent frequencies in a different manner, thus a system will sound a bit different depending on the barometric preassure level.