NOAA's data says 1 inch of snow on the ground at 7am, Dec 25. Here is how often that happens, by city.
On the ground at 7am, December 25. That is NOAA's official rule, not a guess.
Minnesota, Vermont and Maine all sit above 74% too.
Florida and Hawaii sit at 0%. The whole Deep South runs under 1%.
NOAA gives over 90% odds of a very strong El Nino. See the full guide.
A Penn State scientist says warming narrows the window for snow, except near the Great Lakes. See why.