Career
He debuted in the World Cup in 2003. He has four 4 x 5 km team medals at the FIS Nordic World Ski Championships with a gold in 2005 and bronze in 2007 and twice in 2011. Klemetsen also finished 20th in the 15 km individual event at the 2005 championships.
Klemetsen finished 20th in the 15 km individual at the 2006 Winter Olympics in Turin.
His best individual career finish was second in a 7.5 km sprint event in Park City, Utah in the United States in 2002.