Re: Bees in top box, not normal?
My bees are in the top box as well. When it's sunny they hang around near the upper entrance and peek out. I'm assuming they know what they're doing. They should still have plenty of honey to work on.
Don't open your hive when it below 45F! You will break their propolis seals and let bitter cold drafts in right in the middle parts of the hive where the cluster might be hanging out. Remember, they slow down when they are cold and don't eat as much. As Pife says, don't open at all under 45F, and then do whatever very quickly and close back up quickly!
Me, I'm not opening my hives at all til Spring.
The little bee returns with evening's gloom,
To join her comrades in the braided hive... -Tennyson