By
The central bank set the official midpoint at 6.1395 per dollar on Thursday morning, the highest rate since mid-March when the bank widened the official trading band.
The spot market went on to quickly rise to 6.1209 per dollar before backing off slightly. The currency has been rallying slowly but steadily since late September.
It last closed at 6.1219.
The dollar index was sharply lower on Thursday, its appeal deeply dented after poor US data sparked growth concerns that sent equities tumbling and Treasury yields plunging.