Hi Ethan,
I see you're new to the forum so welcome to you.
Just as Jakes said, there are very few things that affect these little guys, or at least very few things we know about.
I'm no expert but I can tell from what I've seen here and on other forums that most of the issues people have with their T's are environmental. Fungi, humidity, parasites etc.
The best you can do is keep him fed and watered. Keep an eye out for anything out of the ordinary in the enclosure and enjoy the view.
I think Uncle Stan said a few times: "we are the weaker species"
As far as the cold goes, yeah, they definately slow down in the cold and mostly keep under the covers so to speak.
Strangely enough though I have a few... N.chromatus, C.fasciatum and B.emilia who spend most of their days out in the open all of a sudden
Sometimes I think my sole purpose in life is to serve as a warning to others