Winter weather lovers are wondering what if anything the warm October means going forward with regards to the winter. The stats on this really don't have much value however when you combine a warmer than average October with a warmer than average November you do get some evidence that it leads to a warmer winter with below average snowfall
In Philadelphia at least the statistics going back to 1900 are rather convincing. Looking at the warmer October November combinations of which there are 10 of then, it has resulted in below average snowfall in 9 of the 10 winters. With regards to temperatures it produced only 2 winters where the temperatures were below average with one right at average. Granted there are other factors involved and the sample is rather small with just 10 winters meeting the cut. 1 winter had a strong el nino and 2 had strong la nina conditions. The rest were neutral with a nino/nina bias in both directions. Also we are talking about 1 specific point here and not an entire region.