Winter's our favorite time to camp. No bugs, no people, no worries about fires, and water everywhere. We have two different Egyptian cotton tents that are very cozy with a tent stove:
My wife, son and I spent a minus 10 fahrenheit night in this shelter. We were comfortable, but we sure used a lot of firewood.
There's an island we camp on year round, except when the ice is too thin to walk on but too thick to bust through:
A buddy and I had a bushplane drop us off on a ridge in Alaska, we stayed there for ten days hunting moose. Didn't have a thermometer, but it was cold:
Twice now we've spent nights in igloos. If you can get your sleeping platform higher than the top of the door, they're comfortable, and they don't flap in the wind like tents, so we slept well:
Hope I didn't overdo it with the pictures.