I live in France and my power cuts are less than 10 in +20 years.
Had +5 years of uninterrupted power at my previous place and at the current flat I live, it's currently at +1,5 years.
Over the years it got more reliable but I'm not sure if that was universal or just my specific area getting a lot more built up.
If I had to guess, I would think it's wildly variable based on location and the factors of that location. A more remote community with one main power line through forested area might experience power loss more often, and a larger city with higher density probably has its own problems with load spikes which may cause problems. Maybe a suburb or medium sized city with semi-recent infrastructure is actually the sweet spot for power reliability?
I've got solar, though, and a house battery is very much on the list once my budget allows it. I don't see local system stability getting better any time soon, and likely worse now that PG&E has more leeway to shut down power during wind/heat events and the like.
Every month sounds very bad, even when I lived in a countryside in the least wealthy EU province (Lubelskie, Poland) it was never this bad. Maybe once a year (and usually with a warning that it will happen).
Power is a funny thing for computer guys.
I now live in Dublin and I've had one in 6 years.
It depends where you live and / or you might not notice them if they happen at night.
Even in France which is supposed to be a first world country I experience a couple power cuts every month (twice at night this week-end, it killed my tile generation and corrupted my filesystem on my OSM server).
I probably should invest in a UPS instead of complaining on HN !