Rain had fallen all morning in Montreal to produce a series of small puddles around the circuit, while the cold conditions yielded a track temperature of just 17.5 degrees Celsius at the opening of the session.
Haas pairing Nico Hulkenberg and Kevin Magnussen were first to explore the damp track with the full wet tyre, Hulkenberg setting a 1m34.889s moments before Magnussen kicked off with a 1m34.797s.
