What cable is needed for DHT22 ?

It would help if you supply a link when asking about specific components especially ones that are not main stream.
It looks like this is a single wire that runs at 20 KHz.
So it should be usable on a fair length of cable. You need to ensure the capacitance of the cable is as low as possible so maybe using flat cable would be better than twisted cable.
However you wil only find the limits of distance by experimentation as there's not enough information to work it out. For example exactly what is the capacitance of the cable you will use?