I think it does have to stay on the ground for at least a few hours, yeah. But this year we’ve had snow on the ground every morning for four days, now, and this is so unusual for April, I’m wondering if the term “onion snow” really fits any more. Because I think the sense of it being a one-day affair is also implicit in the term. That is to say, “onion snow” denotes a regular, familiar phenomenon, whereas this weather pattern is beginning to seem very irregular indeed.
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