Can I leave my bike out in the cold?

It's starting to get cold out and I'm wondering how cold it has to get before it's unsafe for my bike, since I'd be leaving it outside during class times. I figured when I parked it in my apartment's bike garage I could take the battery out so it wouldn't be cold 24/7.

I have an Aventon Soltera 7, by the way. The label on the battery says 36V and 9.6Ah but i don't know if that's relevant for this.