very difficult to get a good winter with a December average of 40+
Just picking through this list from bottom to top the notable ones are 1957-58, 2014-15, 1982-83, 2015-16. Some of these were one big snowstorm winters like 1982-83 and 2015-16. 2014-15 was a real standout because of how cold it got from Jan 20 through Mar 20. And it was the only non strong el nino out of the 4, as a matter of fact it wasn't an el nino at all. Was 1891-92 snowy? I'm not familiar with what happened that winter, but it looks like it was the only 1800s winter that had a December average of 40+