The NAO moves toward positive by the end of the month before heading back negative after the 1st. The PNA moves toward positive at the end of the month and remains slightly positive after the 1st. The latest from the CPC now has the La Nina lasting until February but in a waning state. Forecasts earlier in the fall had La Nina ending after the first of the year. Based on all this, my guess is after a relaxation of the cold at the end of the month, we could see another bout of cold in the east by the end of the first week in January.
https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/nao_index_mrf.shtml