Here is riding in the snow.
http://www.youtube.com/watch?v=6aUWPi829Gw
Most mornings (other than the past couple of days, lol) when I jump on the bike to head to work it is sitting around -30C. Somedays, a little colder some a little warmer but bot much, lol.
The video above was taken one day as I was just getting home from work. I think it was about -15C that day.
As for my travel speed on the snowy, icy roads...usually I cruise around the 40-45 km/h mark.
I haven't bothered with using studded tires for a long time now...probably been a couple or few years, lol. I just run el cheapo MTB tires with a good bite to them.
Best thing to keep in mind when riding on these types of conditions is the same thing that people in cages should think of.
Don't try to stop really fast, don't turn really fast, and don't take off really fast.
If you can get away with travelling and not stopping or taking to many corners you'll be laughing...otherwise, you may be cryin', lol.
Take care, ride safe, and enjoy the video.