Usage patterns
〈場所〉に寒気が入るfor cold air to move into an area
Strong cold air is expected to move into the Kanto region starting tonight.
寒気が緩むfor a cold spell to ease up
The cold spell will ease by the weekend and it should warm up.
強い寒気a strong mass of cold air
A strong mass of cold air is flowing in aloft.
寒気が居座るfor cold air to linger over an area
The cold air from the north looks set to linger for a while.