Stempniak, acquired from Toronto at the trade deadline, also recorded three assists last month and had a plus-7 rating.
Howard posted a 12-2-1 record with a 2.24 goals-against average in March. He also had a .918 save percentage and one shutout.
Sedin led all NHL players with 24 points (four goals, 20 assists) to help the Canucks win nine of 15 games. He concluded the month with a five-game point streak, moving into first place in the NHL scoring race with 104 points (29-75) in 76 games.