Here in the DC metro area the weather isn't that bad yet. I have 20x9.5 with 275 winter tires ready to put on when things get worse.

I use either 25 or 30mm spacers currently with 20x11 in the rear with 315s. I'm going to leave the spacers on as I don't think it will be a problem.

I used to run the same wheels (20x9.5) with 295 and the same spacers, albeit with summer tires.

I think the spacers won't make much difference, either way, so if you like the look (which I do) go with it.

BTW .. I've had the spacers on the X since I bought it when it had 33K and have not experienced any problems so far. I think the X now has 79K miles.