The loss of the Sphinx snow patch is a sign of climate change, says expert Iain Cameron.
Scotland is completely snow-free for the fourth time in the last six years.
The Sphinx, in the Cairngorms, which is historically the longest-lasting patch of snow in the UK, has melted.
Snow expert Iain Cameron reported on Friday that the famous patch had disappeared in the last 24 hours.
It is the fourth time it has gone in the last six years, having only melted nine times in the past 300 years. Mr Cameron said climate change was a likely factor.
The Sphinx, on remote Braeriach, a 1,296m (4,252ft) Munro, has melted away more frequently in the last 18 years.
According to records, it previously melted fully in 1933, 1959, 1996, 2003, 2006, 2017, 2018, 2021 and now 2022.
Before 1933, it is thought to have last melted completely in the 1700s.
Mr Cameron tweeted: “So there we have it. It is confirmed that Scotland is snow-free yet again.
“The last patch, the Sphinx, disappeared sometime in the last 24 hours. “
He added: “I’m not a climatologist (nor even an academic), but it’s a pretty obvious direction of travel.
“The future for semi-permanent snows in Scotland looks bleak.”
Another wonderfully atmospheric day at Garbh Choire Mòr to check whether the last patch of snow in Scotland survived the recent deluges. Amazingly, the Sphinx continues to hang on for dear life. pic.twitter.com/VHEo4DDJNt— Iain Cameron (@theiaincameron)
Just six days ago he had made the climb to check on the patch and described it as “hanging on for dear life.”
Mr Cameron, based in Stirling, has been studying snow patches in Scotland for 25 years and is author of the book The Vanishing Ice, which he describes as a “lament” to snow and ice that lingers high in Scotland’s hills.
He worked alongside the late Dr Adam Watson, a biologist dubbed Mr Cairngorms because of his many years studying the mountains.
Some of Dr Watson’s research on the Sphinx drew on information handed down by generations of people who worked and visited the Cairngorms.
The Scottish Mountaineering Club began noting the fortunes of the patch in the 1840s and more recently scientists and ecologists have gathered information.
Separately from Mr Cameron’s research, a report commissioned by Cairngorms National Park Authority and published in July 2020 said declining snow cover, and fewer days when it snowed had been observed on Cairngorm mountain since the winter of 1983-84.
Researchers also noted a trend for increasingly warmer weather since the 1960s, and suggested that by the 2080s there would be some years with very little or no snow at all on Cairngorm.
The Sphinx lies in Garbh Choire Mor, a hollow known as a corrie formed by ice or a glacier during the last ice age.
Garbh Choire Mor is described as Scotland’s snowiest corrie because of the amount of snow it can hold even through summer months.
The Sphinx is the name of a climbing route near the snow patch.