Boston Fed President Eric Rosengren said on Friday that the Fed could raise its interest rate at every monetary meeting despite falling oil prices, China's economic slowdown, and the ongoing Greek debt crisis.

"I don't rule out any of the meetings from here on out. If we do continue to get improvement in labour markets, if we do become reasonably confident that we're moving back to 2% inflation, it may be appropriate as early as September," he said.

He added that if labour market unexpectedly weakens, if core inflation starts to decline, or if the wage do not climb, then he would like to wait before to raise the interest rate.

Rosengren is not a voting member of the Federal Open Market Committee this year.