There's some shallow, sandy snow on my neighborhood street for about two blocks, but very little traffic and the street is wide, so I just keep vertical.
There's some areas in the bike lane with ice or deeper snow, but I just ride around them.
The majority of the streets are salty and either dry or wet.

You made a good point earlier. Since you ride in such close proximity with automotive traffic, your stakes are much higher than mine in my much smaller city. I rarely get passed during my commute with less than 5' of cushion.

The tires on my folder do have some tread. Far from knobbies, but not slicks either. You can see it in the left side of this pic:

"street tread"

You might consider fitting gravel tires on your bike for the winter. They do fine in snow too:

These handle < 2" of snow just fine. I wouldn't risk much ice though.