2004
January / Ionawr 2004
February / Chwefror 2004
March / Mawrth 2004
April / Ebrill 2004
May / Mai 2004
June / Mehefin 2004
July / Gorffennaf 2004
August / Awst 2004
September / Medi 2004
October / Hydref 2004
November / Tachwedd 2004
December / Rhagfyr 2004