This happened early June but then none since so the sun has done its job and there has been no real top up. The insulating factor is one I had not thought of before but can see it as logical. Those years where frosts are early and plentiful would have a better chance of keeping snow from melting. I am not concerned about this season as yet. I have one food drop in place and may get a second in before winter connects properly. I am more concerned about a drier winter not providing for spring growth on the farm. That means feeding out longer or starting to feed out earlier next year.