I'm a warm weather rider, and store my bike in the garage from late October to early March. I know there are some on this forum who ride all year round.
There was snow on the ground yesterday and today, and as I was driving to work I saw a black CBR 125 parked on the street covered in snow. From what I could tell, it looks like it was parked there for both days and had not been ridden.
Riding is a passion for me and I take care of my bike better than I take care of myself. I think some people here are the same, to a certain degree at least.
I'm a pretty easy going guy, but I don't know why it bothered me when I saw the bike like that. It doesn't take long to put a bike cover, or even a cheap tarp on top.
I don't think snow is that much different than rain as far as the bike is concerned. I don't know if snow can damage anything mechanically but, better safe than sorry right?
Anyway if this is your bike, I suggest investing in a bike cover or tarp, if there isn't a garage or covered storage area.