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It's very circumstantial, slope and orientation make a big difference. so it has to be a calculator where you put in specific information.
I think this does it: https://pvgis.com/
There'd nbe loads of others. I'd expect most reputable solar installers aimed at residential to have calculators, or recommend one as part of the planning process. Maybe with localised assumptions. There's one from a govt funded body in my country that makes cost and price assumptions too tand gives a 'return on investment' guess.
That's a neat tool. But it's giving me a slightly confusing result. I have a solar installation and I've plugged in the details so far as I know them, just to see if I'm producing about what I "should" be. The peak production month is about right, but the minimal production month is only estimated to be like 25% less than that. My system has more like 50-60% drop, and some quick googling suggests that's about normal.
Any thoughts on why this tool suggests a much smaller drop?
No idea. The 'typical meterological year' is likely smooth some extremes - that will likely have less variance than any actual year. Maybe the geographical resolution is poor leading to more averaging. But that sounds a bit large of a difference to be just that. Was the total annual production way out?
Check some other tools , maybe a local one - another one might have better data on some things. Some consensus of several estimates might be better than relying on one calculator only.