5th grade can be kind of tricky to keep on track. That is a really tough time to keep the kids engaged, I wish you luck with that!
Maybe getting an idea of what the students like to know about their community will help? IF they are in the city, or a more urban environment in general, they might be more interested in learning how the cities impact earth's spheres, and if they are in a more rural area, then learning more about the impact they have on the world might help. Trying to keep things relevant to the students tends to help keep students attentions on the lesson.
After a quick google search, I found a few things that might help, although I was have a hard time finding anything specific to winter time.
Anyone else have any suggestions?