Hamilton says warmer temperatures hindered McLaren during qualifying in Canada

The Briton had been quickest in both Friday practice sessions, but was beaten to pole by Red Bull's Sebastian Vettel.

"It was definitely a bit harder for us today," Hamilton said. "We struggled working with the tyres, we were trying really hard to get the tyres to switch on, but fortunately we had a new set in Q3 and managed to get through.

"I'm happy with performance, and surprised to see us on the front row, but we will be trying as hard as we can tomorrow."

Hamilton said he was not sure how McLaren's tyre performance would stack up in race conditions.

"Fortunately I have got myself into a decent position," he said. "Long runs seemed to be OK but now it's hotter it will change things and it will be tough. We'll try to do the best job we can and maximise all we can do. I am looking forward to it."

Although he is within 13 points of championship leader Fernando Alonso in fourth in the standings, Hamilton has yet to win a race this year. He said he would be content to continue to gather points in the race if Red Bull and Ferrari proved quicker.

"Of course I want to win but these guys are phenomenally quick at the moment," he said. "Not sure if we have the pace but we will wait and see tomorrow."