Michael Gallagher, who accurately predicted the current big freeze three weeks ago, said the outlook for the coming weeks was for little change.
"The signs were very bad back then and I'm sorry to say there is very little change. I have never seen animals and birds so agitated," he said.
The 62-year-old, who has been delivering post in Donegal's Bluestack Mountains for more than 40 years, said that the only possibility for brief respite would come with the new moon on Sunday night.
"This will either make or break it. If a change doesn't come then, we will be looking at least at the next full moon two to three weeks from now," he said.
Michael observes the movements of insects, birds and animals in the wild to make his predictions, and cannot remember snow settling so early in the year.
"The signs are very bad. There's nothing out there that makes me feel happy. Everything is very agitated out there. There is a wild hunger which is making the foxes, blackbirds, deer, everything, come closer to the people. That's always a bad sign," he added.