I rode Somerville to Cambridge for a few years. Snow gets cleared off the main streets pretty well. The only times there will be snow on the street is the morning after a big storm or during an actual storm. I don't think there was a year that I couldn't bike my commute more than 4 days due to snow.

The streets get sanded and will be wet, so it gets messy. And the snowbanks make the street narrower. Get some fenders, stick to the major roads, take it easy and you'll be fine.