Iain Cameron, 43, an amateur snow researcher, is fascinated by long-lying snow and leads a growing community of obsessives dedicated to celebrating and recording the vestiges of winter. He spends much of his spare time documenting the snow patches of Scotland during the summer months. He climbed the north face of Ben Nevis to document the summertime snow levels.
Some snow patches routinely survive through the summer, only to be buried under fresh falls the following winter.
Patches of long-lying snow in Scotland have been written about since the 18th century.
All the data explorer passed to scientists and ecologists and may shed light on aspects of global warming. The largest patch, at Observatory Gully, sits at an altitude of around 1,130 metres (3,707 ft).
All Images © Murdo MacLeod for the Guardian