Ben Nevis the summit only to find "fragments of earthen and glass ware, chicken bones, corks, and bits of paper". It was not until 1847 that Ben Nevis was confirmed by the Ordnance Survey as the highest mountain in Britain and Ireland, ahead of its rival Ben Macdhui. The summit observatory was built in the summer of 1883, and would remain in operation for 21 years. The first path to the summit was built at the same time as the observatory and was designed to allow ponies to carry up supplies, with a maximum gradient of one in five. The opening of
Ben Nevis and January, and 55 per cent of the time in May and June. The average winter temperature was around , and the mean monthly temperature for the year was . In an average year the summit sees 261 gales, and receives of rainfall, compared to only in nearby Fort William, in Inverness and in London. Rainfall on Ben Nevis is about twice as high in the winter as it is in the spring and summer. Snow can be found on the mountain almost all year round, particularly in the gullies of the north face – with the higher reaches of