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