Yes, I am so glad that you asked this! This is an area in which I have experience. When does it start snowing in Thunder Bay?
I find winter camping to be much easier when there is snow on the ground, and preferably a decent amount. Snow is the best insulator you can pack it around the bottom outside of your tent. If there is enough snow on the ground, you can make a quinzee snow hut. The temperature inside a snow hut is always 30-32 degrees, no matter how cold it is outside of the hut. Snow is clean so it is safe to use it for drinking water. (but when you melt snow to turn it into drinking water, always start with a few cups of water in the pot instead of throwing snow in there to melt right away. Starting with a bit of water in your melting process makes for a world of difference. It's much faster when you start with water versus straight snow right away)
Other tips:
-sleep with your water inside your sleeping bag to keep it from freezing. Sleep with your extra clothes inside your bag to keep them warm so it is not unpleasant to change into them in the morning
-avoid cotton as a choice of clothing. Wool is where it's at. Cotton is not good, it makes you sweat, and sweating makes you wet, which brings down your body temperature. Wool is breathable. On your body, wear synthetic layers under, and wool over. Layers are very important.
-take good care of your feet, wear synthetic liners under, and thick wool socks over.
-line the bottom of your tent, underneath, with many many spruce branches. They are soft and serve as an excellent insulator. You need to have a barrier between you and that cold ground. This is essential. Without a barrier you will be much colder.
-if there a significant difference between daytime and nighttime temperatures, you will have to be careful in order to keep the morning dew off of your sleeping bag, your tent, and all of your possessions. Do this by venting your tent (in other words, do not seal yourself in tight) and by using a bivy sack over for your sleeping bag. In a pinch you can fashion a bivy sack cover out of heavy trash bags.