Definitely check out the video msinger linked to.
Personally I have not flown in winter (yet), but here is a summary of some of the points in the video that stuck out to me:
1. Icing on the props.
I plan to fly in New Hampshire or Vermont where winters are cold and *dry*. I don't know what its like in Minnesota, but if its a wet cold (i.e. more humid), then you want to really watch out for icing. Also, he mentions being careful flying through fog in the winter.
2. Moisture in the gimbal.
This should probably be a concern any time of year, but with snow, ice, and melt (and slush from salted roads), I guess its even more of a concern in winter.
In the video, he says this could occur as a result of long grass. I speculate it could also be caused as the props spin up and blow snow, slush, etc around. So launch from a plastic sheet, or better yet, from the top of a carrying case.
3. Battery life shorter. Keep spare batteries warmer.
He suggests keeping spare batteries in your pocket, but I'd leave them in an idling car. In Northern Vermont (and I presume Minnesota), where it gets truly cold, pockets never really seem to be good enough to keep electronics warm.
4. Cold fingers.
Your from Minnesota. You don't need to be told how to keep your hands warm.

Having said that, there are flying gloves like these:
http://hobbyking.com/hobbyking/store/__ ... eady_.html
EDIT: ... or conductive gloves like these (for touch screens):
http://www.backcountry.com/spyder-condu ... stop-glove