Since it is so cold in your area, and they are warm blooded creatures, they will likely feel like they need to eat more to stay warm. The food is harder to find since much of it is covered, so, more time feeding is probably in order. I've found more day light hours of movement, but not necessaraly in the food plots or fields. Maybe acorns or green briar in the woods.
Also, if you have access to a large plot of land, you could perform my all time favorite - the stalk!
Hope you're up to a lot of walking - bring some supplies!