I would definitely get some all season tires. That way you can use them when you get back and even in the summer. Snow tires would be overkill as you can get around fine in all seasons in snow. I drove my RS on stock RE092 all season tires 4 winters in Ontario Canada. Just have to be extra careful in the snow, your stopping distances are about 3 times greater in snow.
Your current tires would not fair well at all in snow. I wouldn't risk it on summer tires if there is a chance of snow because you may end up stranded or in the ditch.