"One should never attach too much significance to any single monthly report," Yellen said, adding that the overall labor market situation has been "quite positive".
In her first comments since Friday's monthly jobs market data shocked markets, Yellen stressed that she thought the US economy would continue to grow moderately, that the labor market had nearly eliminated all slack, and that inflation would turn higher.
While all are key factors in the Fed deciding whether to tighten monetary policy, she backed off from making specific forecasts for interest rate increases, only saying they should come "gradually".
"A UK vote to exit the European Union could have significant economic repercussions," she warned.