It's doable. If you can find studded tires for your scooter, fit them. If not, try ice screws, either Gold Screws or Kold Kutters. Fit the tires with the deepest, most aggressive tread you can find, and use the longest screws you can without going through the carcass. 5/8" or longer will stay in the best.
The number of screws you use depends on what kind of conditions you will ride in the most. If you see mostly clear pavement, keep the center of your tread free of screws. If the road will be mostly hardpack or ice, run the screws all the way across the tread. You don't need a lot of screws, no more than one per knob or every other knob on a typical DOT knobby.
A 150 should work ok for you as long as you do not have to run in fast traffic.
For winter riding tips, join the Rounders:
http://www.yearroundriders.com/join.html
Seven Elephant Rides, regular winter riding in MN, and a little bit of time on the ice.