Unfortunately the Focus's increase was due in part to the increase of the overall segment it appears. The Civic was up 61% and sold almost 50% better than the Focus, despite near universal deriding by the automotive press. The Elantra was up 46%. The Cruze very nearly beat the Focus despite being up 'only' 27%.
At least the Focus was Ford's second best selling model this month after the F150. Usually it's behind the Fusion and Escape I think.