I was hiking in the Catoctins on Tuesday. I noticed a lot of this. I was at Cunningham Falls. Down at the Falls between two ridges was like 28 degrees with powdery snow. I hiked up to about 1600 feet from 1200 feet. Once I hit about 1500 feet suddenly it's warm, probably 36, and theres water funning down the rocks below the snow. As im hiking back down suddenly, within 10 feet the temp went back below freezing and it was silent. You could literally look up towards the top and see dropping from trees. The mountains are so cool when it comes to this stuff. I love it. Super fascinating.