In reply to galpinos:
Almost certainly re: elevation. Snow is bad at conducting thermal energy, and if it’s fresh it has an incredibly high albedo (c. 0.8) so reflects most radiative stuff. Plus water within the snowpack is well, water, so above 0, and will percolate down into the groundwater in the turf beneath.
Edit: don’t know the exact location of the snow line at present, social media seems to suggest 700m?
In my experience that’s been the case. Turf on proper mixed routes seems solid when the 5cm is below zero - can’t speak as much for gullies as I’ve not bothered to any since the sensor went in... I’d suspect that exposed patches of turf probably freeze before that of the sensor, but I don’t know where the sensor is actually placed for comparison.
Post edited at 21:18