The rescue took place at 2,200ft (671m) near Crib Goch after they had gone off a path onto a snowy ledge.
Rescuers said it was extremely cold on the peak and the pair were not dressed for the conditions.
They were winched aboard unharmed and flown down to Llanberis at the foot of the mountain.
Footprints in the snow had helped to guide the helicopter, based at Valley on Anglesey, to the pair.
A mountain rescue team had been on standby at Llanberis.
Sourced by BBC News Wales