Based on the Köppen climate classification, Rob Roy Peak is located in a marine west coast climate zone, with a subpolar oceanic climate (Cfc) at the summit.[6] Prevailing westerly winds blow moist air from the Tasman Sea onto the mountain, where the air is forced upwards by the mountains (orographic lift), causing moisture to drop in the form of rain and snow. This climate supports the Maud Francis Glacier and Rob Roy Glacier on the mountain's slopes. The months of December through February offer the most favourable weather for viewing or climbing this peak.[7]
South Ridge / Rob Roy Glacier – Ernie Smith, Monty McClymont, Cedric Benzoni, Bob Fullerton, George Palmer, Don Divers, Russell Edwards, George Edwards, and Gordon Edwards – (1935)
North Ridge – Paul Powell, Frank Cooper – (1954)
East Ridge – Tony Bowden, Graham Bishop – (1963)
From Aspiring Hut (West Face) – Don Morrison, Peter Child – (1964)
South Face Original Line – Bob Cunninghame, Limbo Thompson, Pete Glasson – (1972)
South East Corner (South Face) – Pete Moore – (1972)
North Face – Bruce Robertson, Laurie Kennedy – (1975)
A Couple of Days (South Face) – Dave Vass, Allan Uren – (1997)
South West Ridge – Phil Penney, Simon Harris – (1998)
The Zone (South Face) – Craig Jefferies, Steve Moffat, Gareth Sharp – (1999)
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