[neffy]

I find it´s best to make a mental note, and talk to Uncle´s friends. There is an intergenerational information transfer band if you pay enough attention to it. Plus your own memory will inform you after a while.

I remember growing up and there being 3-4 weeks of snow around January and putting on multiple pairs of socks to play in it. My mother remembers there being a couple of feet of snow up into March, and getting trapped once driving across Dartmoor.

Perhaps your children will ask you what snow was.

[benj111]

Agreed, but that isn't science.

You could use it as a prompt to start doing more research to see if there actually is less snow. I'm not sure what else you could do with that information though, a tool for raising awareness of climate change?

Photos are better, they're useful for things like measuring glacier retreat. But even in your example there would be issues, if snow becomes noteworthy more people will take photos of it, so already you can only be confident of looking at the most extreme examples.