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Hello. I have just remembered an event a few years ago which I found fascinating. It was april, there was a little bit of snow left at the top if the hill. That bit last for 5 full days, temperatures where upto 18/19c each and every one of those days. Humidity was low around 30percent and it got to freezing some nights.
Saying that the snow starts to melt here once it goes over 1c I found this fascinating. What is the highest temperature that an area of not very deep snow can survive in? The snow has to last more than a day.
If it's 18c at sea level, snow can still be present on high ground. Snow patches last all year in the Scottish Highlands.
Lower down, I recall the snow lasting for a pretty long tine in February 2009 even with temperatures above freezing (reaching 6C on some days). The snow was frozen though.
Probably a high of 5 C / 41 F or so. The deeper the snow, the longer it will survive to some extent. 6 feet of solidly packed snow won't all melt even on a 50 C / 122 F day.
I don't know, but it can be weird. Last April I was in a t-shirt, and it was 60 degrees. I was climbing around on little snow/ice piles! VERY weird experience. I don't know how that happened.
But maybe, since it had gotten below freezing at night, the snow that had already melted refroze, creating lots of ice, slowing down the melting process. Usually the snow is melted by mid April, last year the exceptions.
I love balmy early spring days with a snowpack on the ground. Did some cross-country skiing in short sleeves in the Jura highlands in February 2012. The snowpack was more than 1 meter deep. The temperature hit 17°C one day, with birds chirping. Night temps were below freezing though. A few days before, the min/max temps were -27/11°C in a nearby frost hollow. In the valleys, one could almost feel the temperature drop at sunset. Snow eventually becomes hard like rock and can survive many weeks in that sort of weather, unless the ground underneath is warm.
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