Zippo doesn't work in the cold?

Good Morning,

I've had an old Zippo (made in 2006) for a few days now. So I can use it without any problems, I've replaced everything. I replaced the flint, wick, refilled the fuel, and cleaned it completely. It worked perfectly. However, only until I took it outside (around -5 degrees Celsius). It wouldn't start outside, which surprised me. Everything worked perfectly again inside. What's wrong? Is it the cold? Can anyone help me?

Thanks in advance:)