bunches of years. Meaning snow came like a lion in some of my earlier life but then while I was a teen it seemed to taper off. Then as an adult it came back as strong as ever and then tapered off. Then guess what... it came in like a lion this season. So... No, I haven’t noticed.
That being said I haven’t went out and measured it either.
I lived in Alpine UT as a child and that’s where I remember the most snow but In San Bernardino it seems like the largest snow storm they had was when they held the winter games at Bigbear. That was around 10 years or so I think.
That aside do you know of any studies showing underwater volcanic activity? And can it be determined if they actually have sufficient data to show it has nothing to do with oceanic temperature or pH?