I'm a big fan of ski goggles, but I'm trying safety glasses as well this year for warm cold weather (down to the mid 20s F or so). Yep, just plain clear safety glasses. They also work well at night in the summer when there are bugs everywhere. I'll be back to ski goggles when it snows heavily and/or I need to cover more skin.

In my experience, goggles will fog in extremely cold weather unless you can find a way to prevent hot air from getting in. There are a number of ways to do this - some more extreme than others.