DRAGONS' Jamie Roberts has bemoaned his side's "desperately frustrating" performance after their derby day defeat at the hands of Cardiff Blues.

The Dragons were hunting their first Boxing Day win since the 2014 upset at the Arms Park and their first triumph against the Blues since the Challenge Cup quarter-final success the following April.

Instead it is now 11 losses on the spin to their nearest and fiercest rivals.

"In a game like this, with that weather, when it’s going to be that tight, these are big things," said Roberts.

"We conceded two penalties, defensive penalties when we were chasing back off kicks.

"It’s just disappointing. They were poor penalties to give away.

"We only have ourselves to blame."

He said that, despite Dragons battling the fierce conditions, it "wasn’t quite enough".

"It was desperately frustrating," he said.

"We missed touch on about 70 minutes, with the chance to really put pressure on in their 22.

"We shanked the kick."

Behaviours and the intricate details of the game are something Roberts believes his side can work on with regards to the changeable weather.

"When the conditions are like this, you’re right under the microscope with those little behaviours," he said.

"If you get them wrong, you concede penalties.

"If you do that against a side as powerful as the Blues, and you put yourself under pressure, you’re going to concede points.

"It was never going to be an expansive game, but we were second best in that second half.

"It was an attritional game, probably not a great game for the neutral to watch."

Fans, neutral or otherwise, were missed by the Dragons players according to Roberts, who said that he was hoping for their return as soon as possible.

"You miss the buzz of the crowd, it’s such a shame. We would have loved to have played here to a sell-out crowd," he said.

"Boxing Day is about the fans. It brings it into context on days like today. We’ve never experienced a Boxing Day like that before and hopefully never will again."

After a defeat against a rival side, Dragons will be looking to any positives they can draw from their performance.

However, Roberts said that they must also focus on ironing out sloppy mistakes ahead of their next game against Scarlets.

"As much as you want to talk about the lads playing well in patches, there were some basic, basic errors," he said.

"It lost us the opportunity to cause problems for them.

"We’re doing some things well, but some things poorly and that’s just not good enough at this level.

"You get found out.

"We’re playing a side next week in the Scarlets who are a very good side.We’ll have a look at what the weather report is saying and adapt."