"It's getting colder now. Winter is here."

Translation: 现在越来越冷，冬天来了。

[ToEach_TheirOwn]

Why is 了 used here? I thought it indicates something that happened in the past? Is it because winter is already here, therefore the action of "being here" already happened?

[CharlesE780046]

Would 冬天到了 work?

[looli23]

Yes, definitely