Before trans: I'm guessing that while it's nice and warm in the caverns, it's still cold outside?

It seems it *was* warm out, but by the time she woke up and popped out it went back to being winter.

I don't blame you little ant, I'm sick of this fluctuating weather too.

Poor little Ari-chan. Stay in bed where it's nice and warm! Don't worry, we'll let you know when it's OK to come out!
[Others' headcanon may vary, of course.]