when a customer asks me if the weather's going to be nice, i say something like - as long as you dont sing - which brings a look of confusion from some people - is it a welsh thing or a local ceredigion thing that we connect bad weather to someone singing badly?
Here in Cumbria if a tourist asks ---- Whats the weather going to do . We say ..Look at the hill tops ... if you can't see them its raining.....if you can see them its going to rain.
Not sure if it is only a Welsh thing, as I live in Shropshire, and we have that here too. If it is raining we say "Have you been singing again"? and I am sure I have heard that before I came to Shropshire. I think it is a well known thing, not just in Wales.