That's only 24 degrees F...if you bring them in you may force them to molt.
Chickens are designed to be able to easily withstand those temps.
There are many BYC keepers whose birds roost in trees and they're fine.
We have the same temps here in Idaho and the people down the street have probably 25 peacocks and they all roost in these huge trees and they're fine.
They don't have skin like people, they have a thick feather jacket on.
What is happening in the mid-west of the US right now is unusual and very dangerous with windchill temps approaching -70 F!!
If that were me I would be bringing my birds in the garage or something.
It's bad. Mine are all inside. There is no way I felt even a little bit comfortable kerping them outside in this.